| Prefix | Namespace | Title |
| acco | http://purl.org/acco/ns# | Accomodation Ontology |
| acl | http://www.w3.org/ns/auth/acl# | Basic Access Control ontology |
| acm | http://acm.rkbexplorer.com/ontologies/acm# | ACM Classification Ontology |
| ad | http://schemas.talis.com/2005/address/schema# | Address Schema |
| adms | http://www.w3.org/ns/adms# | Asset Description Metadata Schema |
| af | http://purl.org/ontology/af/ | Audio Features Ontology |
| agls | http://www.agls.gov.au/agls/terms/ | AGLS Metadata Terms |
| agrelon | http://d-nb.info/standards/elementset/agrelon.owl# | Agent Relationship Ontology |
| aiiso | http://purl.org/vocab/aiiso/schema# | Academic Institution Internal Structure Ontology |
| akt | http://www.aktors.org/ontology/portal# | AKT Reference Ontology |
| akts | http://www.aktors.org/ontology/support# | AKT Support Ontology |
| algo | http://securitytoolbox.appspot.com/securityAlgorithms# | Algorithms Ontology |
| ao | http://purl.org/ontology/ao/core# | Association Ontology |
| aos | http://rdf.muninn-project.org/ontologies/appearances# | Appearances Ontology Specification |
| api | http://purl.org/linked-data/api/vocab# | Linked Data API Vocabulary |
| arch | http://purl.org/archival/vocab/arch# | Archival collections ontology |
| awol | http://bblfish.net/work/atom-owl/2006-06-06/# | Atom Syndication Ontology |
| b2bo | http://purl.org/b2bo# | Business to Business Ontology |
| being | http://purl.org/ontomedia/ext/common/being# | OntoMedia Being Representation |
| bibo | http://purl.org/ontology/bibo/ | The Bibliographic Ontology |
| bibtex | http://purl.org/net/nknouf/ns/bibtex# | BibTeX ontology |
| bio | http://purl.org/vocab/bio/0.1/ | BIO: A vocabulary for biographical information |
| biol | http://purl.org/NET/biol/ns# | Biological Taxonomy Vocabulary 0.2 (Core) |
| biopax | http://www.biopax.org/release/biopax-level3.owl# | BioPAX Level 3 ontology |
| biotop | http://purl.org/biotop/biotop.owl# | BioTop |
| biro | http://purl.org/spar/biro/ | The Bibliographic Reference Ontology |
| botany | http://purl.org/NET/biol/botany# | Biological Taxonomy Vocabulary 0.2 (Botany) |
| br | http://vocab.deri.ie/br# | Brainstorm Ontology |
| c4n | http://vocab.deri.ie/c4n# | Call for Anything vocabulary |
| c4o | http://purl.org/spar/c4o/ | C4O, the Citation Counting and Context Characterization Ontology |
| cal | http://www.w3.org/2002/12/cal/ical# | Internet Calendaring and Scheduling Core Object Specification |
| cc | http://creativecommons.org/ns# | Creative Commons Rights Expression Language |
| cco | http://purl.org/ontology/cco/core# | Cognitive Characteristics Ontology |
| cdm | http://purl.org/twc/ontology/cdm.owl# | Conceptual Depth and Momentum |
| ceo | http://www.ebusiness-unibw.org/ontologies/consumerelectronics/v1# | Consumer Electronics Ontology |
| cert | http://www.w3.org/ns/auth/cert# | The Cert Ontology |
| cgov | http://reference.data.gov.uk/def/central-government/ | Central Government Ontology |
| chord | http://purl.org/ontology/chord/ | The OMRAS2 Chord Ontology |
| cito | http://purl.org/spar/cito/ | CiTO, the Citation Typing Ontology |
| citof | http://www.essepuntato.it/2013/03/cito-functions# | Functions of Citations |
| cmo | http://purl.org/twc/ontologies/cmo.owl# | Conceptual Model Ontology |
| cnt | http://www.w3.org/2011/content# | Representing Content in RDF |
| co | http://purl.org/ontology/co/core# | Counter Ontology |
| cogs | http://vocab.deri.ie/cogs# | COGS Vocabulary |
| cold | http://purl.org/configurationontology# | Configuration ontology |
| coll | http://purl.org/co/ | Collections Ontology |
| comm | http://vocab.resc.info/communication# | Vocabulary related to incident communication |
| con | http://www.w3.org/2000/10/swap/pim/contact# | Contact |
| conversion | http://purl.org/twc/vocab/conversion/ | Conversion Ontology |
| coo | http://purl.org/coo/ns# | Car Options Ontology |
| coun | http://www.daml.org/2001/09/countries/iso-3166-ont# | ISO 3166 Country Codes |
| cpa | http://www.ontologydesignpatterns.org/schemas/cpannotationschema.owl# | Content Pattern Annotations |
| crm | http://purl.org/NET/cidoc-crm/core# | CIDOC Conceptual Reference Model in OWL |
| crsw | http://courseware.rkbexplorer.com/ontologies/courseware# | ReSIST Courseware Ontology |
| cs | http://purl.org/vocab/changeset/schema# | Changeset |
| csp | http://vocab.deri.ie/csp# | Constraint Satisfaction Problems Vocabulary |
| ct | http://www.tele.pw.edu.pl/~sims-onto/ConnectivityType.owl# | Connectivity types |
| ctag | http://commontag.org/ns# | Common Tag Vocabulary |
| ctorg | http://purl.org/ctic/infraestructuras/organizacion# | Vocabulario de la estructura de organismos públicos |
| d2rq | http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1# | D2RQ - Language Specification |
| dady | http://purl.org/NET/dady# | Dataset Dynamics (dady) vocabulary |
| daia | http://purl.org/ontology/daia/ | Document Availability Information Ontology |
| dcam | http://purl.org/dc/dcam/ | DCMI Abstract Model |
| dcat | http://www.w3.org/ns/dcat# | Data Catalog Vocabulary |
| dce | http://purl.org/dc/elements/1.1/ | Dublin Core Metadata Element Set |
| dcite | http://purl.org/spar/datacite/ | The DataCite Ontology |
| dcndl | http://ndl.go.jp/dcndl/terms/ | NDL Metadata Terms |
| dcterms | http://purl.org/dc/terms/ | DCMI Metadata Terms |
| dctype | http://purl.org/dc/dcmitype/ | DCMI Type Vocabulary |
| deo | http://purl.org/spar/deo/ | The Discourse Elements Ontology |
| dir | http://schemas.talis.com/2005/dir/schema# | Directory Schema |
| dl | http://ontology.ip.rm.cnr.it/ontologies/DOLCE-Lite# | The DOLCE and DnS ontologies in OWL |
| doap | http://usefulinc.com/ns/doap# | Description of a Project vocabulary |
| doc | http://www.w3.org/2000/10/swap/pim/doc# | Works, licences, derivatives and dependencies |
| doco | http://purl.org/spar/doco/ | DoCO, the Document Components Ontology |
| dqm | http://purl.org/dqm-vocabulary/v1/dqm# | The Data Quality Management Vocabulary |
| dr | http://purl.org/swan/2.0/discourse-relationships/ | Discourse relationships vocabulary |
| drm | http://vocab.data.gov/def/drm# | Data Reference Model |
| ds | http://purl.org/ctic/dcat# | Dataset Catalog Vocabulary |
| dso | http://inference-web.org/2.0/ds.owl# | Data Structure Ontology |
| dtype | http://www.linkedmodel.org/schema/dtype# | Datatype Ontology |
| dul | http://www.ontologydesignpatterns.org/ont/dul/DUL.owl# | DOLCE+DnS Ultralite |
| earl | http://www.w3.org/ns/earl# | Evaluation and Report Language |
| ebucore | http://www.ebu.ch/metadata/ontologies/ebucore/ebucore# | EBU Ontology |
| edm | http://www.europeana.eu/schemas/edm/ | Europeana Data Model vocabulary |
| elec | http://purl.org/ctic/sector-publico/elecciones# | Vocabulario de Resultados Electorales |
| emp | http://purl.org/ctic/empleo/oferta# | Vocabulario de Ofertas de Empleo |
| ends | http://labs.mondeca.com/vocab/endpointStatus# | Vocabulary of endpoint status (availability, responseTime) |
| ep | http://eprints.org/ontology/ | EPrints Ontology |
| event | http://purl.org/NET/c4dm/event.owl# | The Event Ontology |
| ex | http://purl.org/net/ns/ex# | Example vocabulary |
| exif | http://www.w3.org/2003/12/exif/ns# | Exif data description vocabulary |
| fabio | http://purl.org/spar/fabio/ | FRBR-aligned Bibliographic Ontology |
| fea | http://vocab.data.gov/def/fea# | Federal Enterprise Architecture Vocabulary |
| foaf | http://xmlns.com/foaf/0.1/ | Friend of a Friend vocabulary |
| food | http://data.lirmm.fr/ontologies/food# | Food Ontology |
| fowl | http://www.w3.org/TR/2003/PR-owl-guide-20031209/food# | Food Ontology in OWL |
| frapo | http://purl.org/cerif/frapo/ | Funding, Research Administration and Projects Ontology |
| frbr | http://purl.org/vocab/frbr/core# | Expression of Core FRBR Concepts in RDF |
| frbre | http://purl.org/vocab/frbr/extended# | Extended FRBR |
| fresnel | http://www.w3.org/2004/09/fresnel# | Fresnel Lens and Format Core Vocabulary |
| g50k | http://data.ordnancesurvey.co.uk/ontology/50kGazetteer/ | 50K Gazetteer Vocabulary |
| gastro | http://www.ebsemantics.net/gastro# | ebSemantics Gastro Ontology |
| gc | http://www.oegov.org/core/owl/gc# | oeGOV Government Core Ontology |
| gd | http://reference.data.gov/def/govdata/ | Government Data Vocabulary |
| gen | http://purl.org/gen/0.1# | Vocabulary for Linked Genealogical Data |
| geo | http://www.w3.org/2003/01/geo/wgs84_pos# | WGS84 Geo Positioning |
| geod | http://vocab.lenka.no/geo-deling# | Land classification in Norway |
| geof | http://www.mindswap.org/2003/owl/geo/geoFeatures20040307.owl# | Geo Features |
| geop | http://aims.fao.org/aos/geopolitical.owl# | FAO Geopolitical Ontology |
| geos | http://www.telegraphis.net/ontology/geography/geography# | Geographis Ontology |
| geosp | http://rdf.geospecies.org/ont/geospecies# | GeoSpecies Ontology |
| gml | http://www.opengis.net/ont/gml# | OGC Geometry |
| gn | http://www.geonames.org/ontology# | The Geonames Ontology |
| gnd | http://d-nb.info/standards/elementset/gnd# | GND Ontology |
| gold | http://purl.org/linguistics/gold/ | General Ontology for Linguistic Description |
| gr | http://purl.org/goodrelations/v1# | The GoodRelations Ontology for Semantic Web-based E-Commerce |
| grddl | http://www.w3.org/2003/g/data-view# | Gleaning Resource Descriptions from Dialects of Languages Vocabulary |
| gso | http://www.w3.org/2006/gen/ont# | Generic Specific Ontology |
| gsp | http://www.opengis.net/ont/geosparql# | OGC GeoSPARQL |
| hdo | http://www.samos.gr/ontologies/helpdeskOnto.owl# | HelpDesk support Ontology |
| hr | http://iserve.kmi.open.ac.uk/ns/hrests# | hRESTS Ontology |
| http | http://www.w3.org/2011/http# | HTTP in RDF |
| idemo | http://rdf.insee.fr/def/demo# | Ontologie démographique de l'INSEE |
| igeo | http://rdf.insee.fr/def/geo# | Ontologie géographique de l'INSEE |
| infor | http://www.ontologydesignpatterns.org/cp/owl/informationrealization.owl# | Information Realization |
| inno | http://purl.org/innovation/ns# | Ontology for Innovation |
| interval | http://reference.data.gov.uk/def/intervals/ | Intervals Ontology |
| iol | http://www.ontologydesignpatterns.org/ont/dul/IOLite.owl# | Information Objects ontology |
| irw | http://www.ontologydesignpatterns.org/ont/web/irw.owl# | The Identity of Resources on the Web ontology |
| is | http://purl.org/ontology/is/core# | Info Service Ontology |
| itsmo | http://ontology.it/itsmo/v1# | IT Service Management Ontology |
| kdo | http://kdo.render-project.eu/kdo# | The Knowledge Diversity Ontology |
| keys | http://purl.org/NET/c4dm/keys.owl# | Keys Ontology |
| label | http://purl.org/net/vocab/2004/03/label# | label |
| lcy | http://purl.org/vocab/lifecycle/schema# | Lifecycle Schema |
| ldp | http://www.w3.org/ns/ldp# | Linked Data Platform |
| lemon | http://www.monnet-project.eu/lemon# | LExicon Model for ONtologies |
| lexinfo | http://www.lexinfo.net/ontology/2.0/lexinfo# | LexInfo Ontology |
| lgdo | http://linkedgeodata.org/ontology/ | LinkedGeoData ontology |
| lib | http://purl.org/library/ | Library extension of schema.org |
| lingvo | http://www.lingvoj.org/ontology# | The Lingvoj Ontology |
| lmf | http://www.lexinfo.net/lmf# | Lexical Markup Framework Ontology |
| lmm1 | http://www.ontologydesignpatterns.org/ont/lmm/LMM_L1.owl# | Lexical MetaModel Level 1 |
| lmm2 | http://www.ontologydesignpatterns.org/ont/lmm/LMM_L2.owl# | Lexical MetaModel Level 2 |
| loc | http://purl.org/ctic/infraestructuras/localizacion# | Vocabulario de Localizaciones |
| locah | http://data.archiveshub.ac.uk/def/ | The LOCAH RDF Vocabulary |
| lode | http://linkedevents.org/ontology/ | Linking Open Descriptions of Events |
| log | http://www.w3.org/2000/10/swap/log# | Logical Formula |
| loted | http://www.loted.eu/ontology# | LOTED ontology |
| lsc | http://linkedscience.org/lsc/ns# | Linked Science Core Vocabulary |
| lv | http://purl.org/lobid/lv# | lobid vocab |
| lvont | http://lexvo.org/ontology# | Lexvo.org Ontology |
| ma-ont | http://www.w3.org/ns/ma-ont# | Ontology for Media Resources |
| mads | http://www.loc.gov/mads/rdf/v1# | Metadata Authority Description Schema |
| maso | http://securitytoolbox.appspot.com/MASO# | Sécurité Agents Mobiles |
| meb | http://rdf.myexperiment.org/ontologies/base/ | The myExperiment Base Ontology |
| media | http://purl.org/media# | The Media RDF Vocabulary |
| mil | http://rdf.muninn-project.org/ontologies/military# | Military Ontology Specification |
| mo | http://purl.org/ontology/mo/ | Music Ontology |
| moac | http://observedchange.com/moac/ns# | Management of a Crisis Vocabulary |
| moat | http://moat-project.org/ns# | Meaning of a Tag Ontology |
| mrel | http://id.loc.gov/vocabulary/relators/ | MARC Code List for Relators |
| msm | http://iserve.kmi.open.ac.uk/ns/msm# | Minimal Service Model |
| msr | http://www.telegraphis.net/ontology/measurement/measurement# | Measurement Ontology |
| music | http://www.kanzaki.com/ns/music# | Music Vocabulary |
| muto | http://purl.org/muto/core# | Modular Unified Tagging Ontology (MUTO) |
| mvco | http://purl.oclc.org/NET/mvco.owl# | Media Value Chain Ontology |
| nao | http://www.semanticdesktop.org/ontologies/2007/08/15/nao# | NEPOMUK Annotation Ontology |
| ncal | http://www.semanticdesktop.org/ontologies/2007/04/02/ncal# | NEPOMUK Calendar Ontology |
| nco | http://www.semanticdesktop.org/ontologies/2007/03/22/nco# | NEPOMUK Contact Ontology |
| nfo | http://www.semanticdesktop.org/ontologies/2007/03/22/nfo# | NEPOMUK File Ontology |
| ngeo | http://geovocab.org/geometry# | NeoGeo Geometry Ontology |
| nie | http://www.semanticdesktop.org/ontologies/2007/01/19/nie# | NEPOMUK Information Element Core Ontology |
| npg | http://ns.nature.com/terms/ | Nature Publishing Group Ontology Terms |
| nrl | http://www.semanticdesktop.org/ontologies/2007/08/15/nrl# | NEPOMUK Representational Language |
| ntag | http://ns.inria.fr/nicetag/2010/09/09/voc# | Nice Tag Ontology |
| oa | http://www.w3.org/ns/oa# | Open Annotation Data Model |
| oan | http://data.lirmm.fr/ontologies/oan/ | Ontologie de l'Assemblée Nationale |
| obsm | http://rdf.geospecies.org/methods/observationMethod# | Observation Method Ontology |
| oc | http://contextus.net/ontology/ontomedia/core/expression# | OntoMedia Core |
| ocd | http://dati.camera.it/ocd/ | Ontologia Camera dei Deputati |
| odapp | http://vocab.deri.ie/odapp# | Open Data Applications Vocabulary |
| odpart | http://www.ontologydesignpatterns.org/cp/owl/participation.owl# | Ontology Design Pattern Participation |
| odv | http://reference.data.gov.uk/def/organogram/ | Organogram Data Vocabulary |
| oecc | http://www.oegov.org/core/owl/cc# | Extended Creative Commons Ontology |
| og | http://ogp.me/ns# | Open Graph Protocol Vocabulary |
| olca | http://www.lingvoj.org/olca# | Ontology Loose Coupling Annotation |
| olo | http://purl.org/ontology/olo/core# | Ordered List Ontology |
| ont | http://purl.org/net/ns/ontology-annot# | Ontology annotation DLiser vocabulary |
| ontopic | http://www.ontologydesignpatterns.org/ont/dul/ontopic.owl# | Ontopic Ontology |
| ontosec | http://www.semanticweb.org/ontologies/2008/11/OntologySecurity.owl# | Ontology Security |
| oo | http://purl.org/openorg/ | Open Organisations |
| opmv | http://purl.org/net/opmv/ns# | Open Provenance Model Vocabulary |
| opo | http://online-presence.net/opo/ns# | Online Presence Ontology |
| opus | http://lsdis.cs.uga.edu/projects/semdis/opus# | SwetoDblp Ontology of Computer Science Publications |
| ore | http://www.openarchives.org/ore/terms/ | The OAI ORE terms vocabulary |
| org | http://www.w3.org/ns/org# | Core organization ontology |
| osadm | http://data.ordnancesurvey.co.uk/ontology/admingeo/ | The administrative geography and civil voting area ontology |
| osp | http://data.lirmm.fr/ontologies/osp# | Ontologie du Service Public |
| osr | http://purl.org/ontomedia/core/space# | OntoMedia Space Representation |
| osspr | http://data.ordnancesurvey.co.uk/ontology/spatialrelations/ | Spatial Relations Ontology |
| ostop | http://www.ordnancesurvey.co.uk/ontology/Topography/v0.1/Topography.owl# | Ordnance Survey Topography Ontology |
| ov | http://open.vocab.org/terms/ | OpenVocab |
| parl | http://reference.data.gov.uk/def/parliament/ | Parliament Ontology |
| part | http://purl.org/vocab/participation/schema# | Participation Schema |
| passim | http://data.lirmm.fr/ontologies/passim# | PASSIM ontology |
| pattern | http://www.essepuntato.it/2008/12/pattern# | The Pattern Ontology |
| pav | http://purl.org/pav/ | Provenance, Authoring and Versioning |
| pay | http://reference.data.gov.uk/def/payment# | Payments ontology |
| pbo | http://purl.org/ontology/pbo/core# | Play Back Ontology |
| pc | http://purl.org/procurement/public-contracts# | Public Contracts Ontology |
| pdo | http://ontologies.smile.deri.ie/pdo# | Project Documents Ontology |
| pext | http://www.ontotext.com/proton/protonext# | PROTON Extent module |
| pkm | http://www.ontotext.com/proton/protonkm# | PROTON Knowledge Management Ontology |
| place | http://purl.org/ontology/places# | The Places Ontology |
| pmlp | http://inference-web.org/2.0/pml-provenance.owl# | PML2 provenance ontology |
| pna | http://data.press.net/ontology/asset/ | Press.net Asset Ontology |
| pnc | http://data.press.net/ontology/classification/ | Press.net Classification Ontology |
| pne | http://data.press.net/ontology/event/ | Press.net Event Ontology |
| pni | http://data.press.net/ontology/identifier/ | SNaP Identifier Ontology |
| pns | http://data.press.net/ontology/stuff/ | Press.net Stuff Ontology |
| pnt | http://data.press.net/ontology/tag/ | Press.net Tag Ontology |
| po | http://purl.org/ontology/po/ | Programmes ontology |
| poder | http://poderopedia.com/vocab/ | Poder Vocabulary |
| postcode | http://data.ordnancesurvey.co.uk/ontology/postcode/ | Postcode Ontology |
| poste | http://data.lirmm.fr/ontologies/poste# | Ontologie de la Poste |
| ppo | http://vocab.deri.ie/ppo# | Privacy Preference Ontology |
| pr | http://purl.org/ontology/prv/core# | Property Reification Vocabulary |
| premis | http://www.loc.gov/premis/rdf/v1# | PREMIS Ontology |
| prissma | http://ns.inria.fr/prissma/v1# | Presentation of Resources for Interoperable Semantic and Shareable Mobile Adaptability |
| pro | http://purl.org/spar/pro/ | The Publishing Roles Ontology |
| prov | http://www.w3.org/ns/prov# | W3C PROVenance Interchange |
| prv | http://purl.org/net/provenance/ns# | Provenance Vocabulary Core Ontology |
| prvt | http://purl.org/net/provenance/types# | Provenance Vocabulary types |
| pso | http://purl.org/spar/pso/ | The Publishing Status Ontology |
| psys | http://www.ontotext.com/proton/protonsys# | PROTON (Proto Ontology), System Module |
| ptop | http://www.ontotext.com/proton/protontop# | PROTON (Proto Ontology), Top Module |
| pwo | http://purl.org/spar/pwo/ | The Publishing Workflow Ontology |
| qb | http://purl.org/linked-data/cube# | The data cube vocabulary |
| qudt | http://qudt.org/1.1/schema/qudt# | Quantities, Units, Dimensions and Types |
| quty | http://www.telegraphis.net/ontology/measurement/quantity# | Measurement Ontology - Basic Quantities |
| radion | http://www.w3.org/ns/radion# | Repository Asset Distribution |
| raul | http://purl.org/NET/raul# | RAUL Vocabulary |
| rdafrbr | http://rdvocab.info/uri/schema/FRBRentitiesRDA/ | FRBR Entities for RDA |
| rdag1 | http://rdvocab.info/Elements/ | RDA Group 1 Elements |
| rdag2 | http://rdvocab.info/ElementsGr2/ | RDA Group 2 Elements |
| rdag3 | http://rdvocab.info/ElementsGr3/ | RDA Group 3 Elements |
| rdarel | http://rdvocab.info/RDARelationshipsWEMI/ | RDA Relationships for Works, Expressions, Manifestations, Items |
| rdarel2 | http://metadataregistry.org/uri/schema/RDARelationshipsGR2/ | RDA Relationships GR2 |
| rdarole | http://rdvocab.info/roles/ | RDA Roles |
| rdfg | http://www.w3.org/2004/03/trix/rdfg-1/ | Graph |
| rec | http://purl.org/ontology/rec/core# | Recommendation Ontology |
| reegle | http://reegle.info/schema# | Renewable Energy and Energy Efficiency |
| rel | http://purl.org/vocab/relationship/ | Relationship |
| rev | http://purl.org/stuff/rev# | Review Vocabulary |
| rov | http://www.w3.org/ns/regorg# | Registered Organization Vocabulary |
| rr | http://www.w3.org/ns/r2rml# | RDB to RDF Mapping Language Schema |
| rss | http://purl.org/rss/1.0/ | Vocabulary for Rich Site Summary (RSS) 1.0 |
| ru | http://purl.org/imbi/ru-meta.owl# | Representational Units Metadata Ontology |
| s4ac | http://ns.inria.fr/s4ac/v2# | Social Semantic SPARQL Security For Access Control Ontology |
| sao | http://salt.semanticauthoring.org/ontologies/sao# | SALT Annotation Ontology |
| sbench | http://swat.cse.lehigh.edu/onto/univ-bench.owl# | An university ontology for benchmark tests |
| schema | http://schema.org/ | Schema.org vocabulary in RDFS |
| scip | http://lod.taxonconcept.org/ontology/sci_people.owl# | Scientific People Ontology |
| scoro | http://purl.org/spar/scoro/ | Scholarly Contributions and Roles Ontology |
| scot | http://rdfs.org/scot/ns# | Social Semantic Cloud of Tags |
| scovo | http://purl.org/NET/scovo# | The Statistical Core Vocabulary |
| scsv | http://purl.org/NET/schema-org-csv# | Schema.org CSV |
| sd | http://www.w3.org/ns/sparql-service-description# | SPARQL 1.1 Service Description |
| sdmx | http://purl.org/linked-data/sdmx# | SDMX-RDF vocabulary |
| sdmx-code | http://purl.org/linked-data/sdmx/2009/code# | SDMX Code |
| sdmx-dimension | http://purl.org/linked-data/sdmx/2009/dimension# | SDMX Dimension |
| sdo | http://salt.semanticauthoring.org/ontologies/sdo# | SALT Document Ontology |
| search | http://sindice.com/vocab/search# | Sindice Search Vocabulary |
| security | http://securitytoolbox.appspot.com/securityMain# | Security Ontology |
| sem | http://semanticweb.cs.vu.nl/2009/11/sem/ | The SEM Ontology |
| semio | http://www.lingvoj.org/semio# | Semio, an ontology of signs |
| seq | http://www.ontologydesignpatterns.org/cp/owl/sequence.owl# | Sequence Pattern |
| sf | http://www.opengis.net/ont/sf# | Simplified Features Geometry |
| sim | http://purl.org/ontology/similarity/ | The Similarity Ontology |
| sioc | http://rdfs.org/sioc/ns# | Semantically-Interlinked Online Communities |
| situ | http://www.ontologydesignpatterns.org/cp/owl/situation.owl# | Situation Pattern |
| skos | http://www.w3.org/2004/02/skos/core# | Simple Knowledge Organization System |
| skosxl | http://www.w3.org/2008/05/skos-xl# | SKOS eXtension for Labels |
| snarm | http://rdf.myexperiment.org/ontologies/snarm/ | Simple Network Access Rights Management Ontology |
| sp | http://spinrdf.org/sp# | SPIN SPARQL Syntax |
| spatial | http://geovocab.org/spatial# | NeoGeo Spatial Ontology |
| spin | http://spinrdf.org/spin# | SPIN Inferencing Vocabulary |
| sport | http://purl.org/ontology/sport/ | Sport Ontology |
| spt | http://spitfire-project.eu/ontology/ns/ | SPITFIRE Ontology |
| sro | http://salt.semanticauthoring.org/ontologies/sro# | SALT Rhetorical Ontology |
| ssn | http://purl.oclc.org/NET/ssnx/ssn# | Semantic Sensor Network Ontology |
| stac | http://securitytoolbox.appspot.com/stac# | Security Toolbox : Attacks and Countermeasures |
| stec | http://www.ida.liu.se/~almhe/Security.owl# | Security Technology Ontology |
| stories | http://purl.org/ontology/stories/ | Stories Ontology |
| swc | http://data.semanticweb.org/ns/swc/ontology# | Semantic Web Conference Ontology |
| swp | http://www.w3.org/2004/03/trix/swp-1/ | Graph Authority |
| swpo | http://sw-portal.deri.org/ontologies/swportal# | Semantic Web Portal Ontology |
| swrc | http://swrc.ontoware.org/ontology# | Semantic Web for Research Communities |
| swrl | http://www.w3.org/2003/11/swrl# | Semantic Web Rule Language |
| tac | http://ns.bergnet.org/tac/0.1/triple-access-control# | TripleAccessControl Ontology |
| tag | http://www.holygoat.co.uk/owl/redwood/0.1/tags/ | Tag ontology |
| tao | http://vocab.deri.ie/tao# | Trust Assertion Ontology (TAO) |
| taxon | http://purl.org/biodiversity/taxon/ | TaxonMap Ontology |
| te | http://www.w3.org/2006/time-entry# | Time Entry |
| teach | http://linkedscience.org/teach/ns# | Teaching Core Vocabulary Specification |
| test | http://www.w3.org/2006/03/test-description# | Test Metadata |
| theatre | http://purl.org/theatre# | Theatre Ontology |
| ti | http://www.ontologydesignpatterns.org/cp/owl/timeinterval.owl# | The Time Interval Pattern |
| time | http://www.w3.org/2006/time# | Time Ontology |
| tio | http://purl.org/tio/ns# | The Tickets Ontology |
| tis | http://www.ontologydesignpatterns.org/cp/owl/timeindexedsituation.owl | Time Indexed Situation |
| tisc | http://observedchange.com/tisc/ns# | Open Time and Space Core Vocabulary |
| tl | http://purl.org/NET/c4dm/timeline.owl# | The Timeline Ontology |
| tmo | http://www.w3.org/2001/sw/hcls/ns/transmed/ | Translational Medicine Ontology |
| trait | http://contextus.net/ontology/ontomedia/ext/common/trait# | OntoMedia Trait Representation |
| transit | http://vocab.org/transit/terms/ | TRANSIT |
| tsioc | http://rdfs.org/sioc/types# | SIOC Types Ontology Module |
| turismo | http://idi.fundacionctic.org/cruzar/turismo# | Ontología de Turismo para el Ayuntamiento de Zaragoza |
| tvc | http://www.essepuntato.it/2012/04/tvc/ | The Time-indexed Value in Context |
| txn | http://lod.taxonconcept.org/ontology/txn.owl# | TaxonConcept Ontology |
| tzont | http://www.w3.org/2006/timezone# | Time Zone Ontology |
| uco | http://purl.org/uco/ns# | Used Cars Ontology |
| umbel | http://umbel.org/umbel# | Upper Mapping and Binding Exchange Layer |
| uniprot | http://purl.uniprot.org/core/ | Uniprot Core Ontology |
| user | http://schemas.talis.com/2005/user/schema# | User Schema |
| vaem | http://www.linkedmodel.org/schema/vaem# | Vocabulary for Attaching Essential Metadata |
| vann | http://purl.org/vocab/vann/ | VANN: A vocabulary for annotating vocabulary descriptions |
| vcard | http://www.w3.org/2006/vcard/ns# | An Ontology for vCards |
| vdpp | http://data.lirmm.fr/ontologies/vdpp# | Vocabulary for Dataset Publication Projects |
| vin | http://www.w3.org/TR/2003/PR-owl-guide-20031209/wine# | Wine Ontology |
| vivo | http://vivoweb.org/ontology/core# | VIVO Core Ontology |
| voaf | http://purl.org/vocommons/voaf# | Vocabulary of a Friend |
| voag | http://voag.linkedmodel.org/voag# | Vocabulary Of Attribution and Governance |
| void | http://rdfs.org/ns/void# | Vocabulary of Interlinked Datasets |
| vra | http://simile.mit.edu/2003/10/ontologies/vraCore3# | RDFS Ontology for VRA |
| vrank | http://purl.org/voc/vrank# | Vocabulary for Ranking |
| vs | http://www.w3.org/2003/06/sw-vocab-status/ns# | SemWeb Vocab Status ontology |
| vso | http://purl.org/vso/ns# | Vehicle Sales Ontology |
| vvo | http://purl.org/vvo/ns# | Volkswagen Vehicles Ontology |
| wai | http://purl.org/wai# | Roles and Profiles Ontology |
| wdrs | http://www.w3.org/2007/05/powder-s# | Protocol for Web Description Resources |
| whois | http://www.kanzaki.com/ns/whois# | Who's who description vocabulary |
| wi | http://purl.org/ontology/wi/core# | The Weighted Interests Vocabulary |
| wl | http://www.wsmo.org/ns/wsmo-lite# | WSMO-Lite Ontology |
| wlo | http://purl.org/ontology/wo/ | Wildlife Ontology |
| wo | http://purl.org/ontology/wo/core# | Weighting Ontology |
| wot | http://xmlns.com/wot/0.1/ | Web Of Trust |
| xkos | http://purl.org/linked-data/xkos# | XKOS |
| zbwext | http://zbw.eu/namespaces/zbw-extensions/ | Extensions to SKOS and other standard vocabularies |