- Pablo Mendes
- paggr CMS
- Palo Alto
- Palo Alto Research Centre
- Paolo Bouquet
- Paris
- Part of speech tagging
- Pascal Hitzler
- Pat Hayes
- Patent Law
- Patent Search Engine
- Patrick Stickler
- Paul Allen
- Paul Miller
- Paul Wlodarczyk
- Pavel Smrz
- Peer39
- Pellet
- Pelorus
- Pennsylvania
- Persistent Uniform Resource Locator
- Personal assistant
- Personal blogs
- Personal Information Model Ontology
- Peter Boncz
- Peter Haase
- Peter Mika
- Peter Vasko
- Pew Research
- Pfizer
- Pharma industry
- Phil Archer
- Phil Windley
- Philipp Cimiano
- PHP
- Phrase extraction
- Piggy Bank
- Ping the Semantic Web
- Placecast
- PlagiarismAnalyzer.org
- Planet RDF
- PlanetData
- playence
- playence platform
- Plugins
- Podcasts
- PolarLake
- Pompeu Fabra University
- PoolParty
- PoolParty Demozone
- PoolParty extractor
- PoolParty PowerTagging
- PoolParty semantic search
- PoolParty thesaurus management
- Portland
- POSC Caesar Association
- Potsdam
- Powerset
- prefix.cc
- Princeton
- Princeton University
- Privacy
- ProBase
- Process management
- Profium
- Profium Digital Archive
- Profium Metadata Server
- Programming languages
- Project Halo
- Property
- Proprietory Datasets
- Prospect
- Protege Plugins
- PROTo ONtology
- Protégé
- Provenance Incubator Group
- Pubget
- Public cloud computing
- Public Domain
- Public Domain Dedication and License
- Publications Office of the European Union
- Publishing industry
- Publishing tools
- punkt. netServices
- PureDiscovery