- August 17, 2010 Patch (Portal)/pl
- August 17, 2010 Patch (Portal)/pt-br
- August 17, 2010 Patch (Portal)/ru
- August 18, 2012 Patch
- August 18, 2012 Patch/fi
- August 18, 2012 Patch/ru
- August 29, 2012 Patch
- August 29, 2012 Patch/fi
- August 29, 2012 Patch/ru
- August 29, 2022 Patch (Portal)
- August 30, 2011 Patch
- August 30, 2011 Patch/fi
- August 30, 2011 Patch/fr
- August 30, 2011 Patch/ko
- August 30, 2011 Patch/pl
- August 30, 2011 Patch/ru
- Authoring Tools
- Authoring Tools/fr
- Authoring tools
- Authoring tools/fr
- Automaton's Top Hat
- Automaton's Tophat
- Automaton's Tophat/cs
- Automaton's Tophat/fi
- Automaton's Tophat/pl
- Automaton's Tophat/pt-br
- Automaton's Tophat/ru
- Automatons top hat
- Automatons tophat
- Autoportal
- BIONIC BEANIE
- BIT.TRIP FLAG
- BIT.TRIP Flag
- BIT.TRIP Flag/fi
- BIT.TRIP Flag/pl
- BIT.TRIP Flag/pt-br
- BIT.TRIP Flag/ru
- BLUE
- BOT'S BERET
- Backpack
- Backpack/de
- Backpack/es
- Backpack/fi
- Backpack/fr
- Backpack/ko
- Backpack/pl
- Backpack/pt-br
- Backpack/ru
- Backpack/zh-hant
- Ballbot
- Barriers
- Bean Cube
- Beanie
- Beanie/fr
- Beanie/pt-br
- Beanie/ru
- Bemondó
- Bendy
- Bendy/es
- Bendy/fi
- Bendy/fr
- Bendy/ja
- Bendy/ko
- Bendy/pt-br
- Bendy/ru
- Beret Robota
- Betty
- Betty/es
- Betty/fi
- Betty/fr
- Betty/pt-br
- Betty/ru
- Bionic Beanie
- Bionic Beanie/cs
- Bionic Beanie/fi
- Bionic Beanie/fr
- Bionic Beanie/pl
- Bionic Beanie/pt-br
- Bionic Beanie/ru
- Bioniczne Beanie
- Bird
- Bird/ru
- Black Mesa
- Black Mesa/cs
- Black Mesa/es
- Black Mesa/fi
- Black Mesa/fr
- Black Mesa/pt-br
- Black Mesa/ru
- Blog
- Blue
- Blue Co-op Bot
- Blue Gel
- Blue Portals (mod)
- Blue Portals Test Chamber 02
- Bob the Janitor
- Bomb
- Bomb/de
- Bomb/fi
- Bomb/fr
- Bomb/pt-br
- Bomb/ru
- Bombs
- Books
- Books/pt-br
- Books/ru
- Boots
- Boots (Video)
- Boots (video)
- Boots (video)/fi
- Boots (video)/ru
- Borealis
- Borealis/fi
- Borealis/fr
- Borealis/pt-br
- Borealis/ru
- Bot's Beret
- Bot's Beret/cs
- Bot's Beret/fi
- Bot's Beret/pl
- Bot's Beret/pt-br
- Bot's Beret/ru
- Bot Trust
- Bot Trust/es
- Bot Trust/pl
- Bot Trust/ru
- Bot Trust (Video)
- Bot Trust (Video)/ru
- Bot Trust (video)
- Bot Trust (video)/fi
- Bot Trust (video)/ja
- Bot Trust (video)/pl
- Bot Trust (video)/ru
- Bots
- Bots/fi
- Bots/pt-br
- Bots/ru
- Bots Beret
- Bottomless Pit
- Box Art
- Box Art/fi
- Box Art/pt-br
- Box Art/ru
- Boxes
- Breaker Room
- Bridge Constructor Portal
- Bridge Constructor Portal/es
- Bridge Constructor Portal/ru
- Bureaucrats
- Button
- Button/fi
- Button/fr
- Button/pt-br
- Button/ru
- Buttons
- Buttons/fi
- COGS FLAG
- COMPLETE PACK
- CUBE N SKULL FLAGS
- Cake
- Cake/de
- Cake/es
- Cake/fi
- Cake/fr
- Cake/pt-br
- Cake/ru
- Cake Core
- Cake Core/fi
- Cake Core/fr
- Cake Core/ru
- Cake Core/zh-hans
- Calibration Course
- Camera
- Cara Mia
- Cara Mia Addio
- Caroline
- Caroline/cs
- Caroline/es
- Caroline/fi
- Caroline/fr
- Caroline/pt-br
- Caroline/ru
- Caroline/zh-hant
- Caroline quotes
- Caroline voice lines
- Caroline voice lines/cs
- Caroline voice lines/de
- Caroline voice lines/es
- Caroline voice lines/fi
- Caroline voice lines/fr
- Caroline voice lines/pt-br
- Caroline voice lines/ru
- Cave
- Cave Johnson
- Cave Johnson/cs
- Cave Johnson/da
- Cave Johnson/es
- Cave Johnson/fi
- Cave Johnson/fr
- Cave Johnson/ja
- Cave Johnson/pt-br
- Cave Johnson/ru
- Cave Johnson/zh-hant
- Cave Johnson quotes
- Cave Johnson voice lines
- Cave Johnson voice lines/cs
- Cave Johnson voice lines/da
- Cave Johnson voice lines/de
- Cave Johnson voice lines/es
- Cave Johnson voice lines/fi
- Cave Johnson voice lines/fr
- Cave Johnson voice lines/ru
- Cave johnson
- Central AI Chamber
- Central AI Chamber/ru
- Central Core
- Central Core/fi
- Challenge Mode
- Chamber
- Chamber lock
- Chamberlock
- Chamberlock/cs
- Chamberlock/de
- Chamberlock/es
- Chamberlock/fi
- Chamberlock/fr
- Chamberlock/ja
- Chamberlock/ko
- Chamberlock/pl
- Chamberlock/pt-br
- Chamberlock/ru
- Chambers
- Characters
- Characters/cs
- Characters/de
- Characters/es
- Characters/fi
- Characters/fr
- Characters/hu
- Characters/ja
- Characters/ko
- Characters/nl
- Characters/pl
- Characters/pt-br
- Characters/ru
- Characters/sv
- Characters/zh-hans
- Characters/zh-hant
- Chell
- Chell/cs
- Chell/es
- Chell/fi
- Chell/fr
- Chell/ja
- Chell/ko
- Chell/pl
- Chell/pt-br
- Chell/ru
- Chell/zh-hans
- CinTech
- Circuit Breaker
- Circuit Breaker/es
- Circuit Breaker/fi
- Circuit Breaker/fr
- Circuit Breaker/ko
- Circuit Breaker/ru
- Classified
- Cleansing Gel
- Cleansing Gel/ru
- Co-Op
- Co-op
- Co-op/cs
- Co-op/es
- Co-op/fi
- Co-op/fr
- Co-op/pl
- Co-op/pt-br
- Co-op/ru
- Cogs Flag
- Cogs Flag/fi
- Cogs Flag/pl
- Cogs Flag/pt-br
- Cogs Flag/ru
- Collaborative Disposition Test
- Collaborative Disposition Test/fi
- Collaborative Disposition Test/ko
- Collaborative Disposition Test/pt-br
- Collaborative Disposition Test/ru
- Combine OverWiki
- Comic
- Commentary
- Community content
- Community content/fi
- Community content/fr
- Community content/pl
- Community content/pt-br
- Community content/ru
- Companion Cube
- Companion Cube/fr
- Companion Cube/ru
- Companion cube
- Complete Bundle
- Complete Pack
- Complete Pack/fi
- Complete Pack/fr
- Complete Pack/pt-br
- Complete Pack/ru
- Complete Pack (Part 2)
- Complete Pack (Part 2)/fi
- Complete Pack (Part 2)/pt-br
- Complete Pack (Part 2)/ru
- Concept art
- Concept art/fi
- Concept art/pt-br
- Concept art/ru
- Confianza entre Bots
- Contraption Cube
- Controls
- Conversion Gel
- Conversion Gel/es
- Conversion Gel/fi
- Conversion Gel/fr
- Conversion Gel/ko
- Conversion Gel/ru
- Conversion Gel/zh-hant
- Coop
- Cooperative Testing Initiative
- Cooperative Testing Initiative/Calibration Course
- Cooperative Testing Initiative/Calibration Course/link
- Cooperative Testing Initiative/Calibration Course/link with introduction
- Cooperative Testing Initiative/Calibration Course/mention
- Cooperative Testing Initiative/Course 1: Team Building
- Cooperative Testing Initiative/Course 1: Team Building/Course 1: Mobility Gels/01 Doors
- Cooperative Testing Initiative/Course 1: Team Building/Course 1: Mobility Gels/01 Doors/fr
- Cooperative Testing Initiative/Course 1: Team Building/Course 1: Mobility Gels/02 Buttons
- Cooperative Testing Initiative/Course 1: Team Building/Course 1: Mobility Gels/02 Buttons/fr
- Cooperative Testing Initiative/Course 5: Mobility Gels
- Cooperative Testing Initiative/Course 5: Mobility Gels/08 Vault Entrance
- Cooperative Testing Initiative/Course 5: Mobility Gels/08 Vault Entrance/link
- Cooperative Testing Initiative/Course 5: Mobility Gels/08 Vault Entrance/link with introduction
- Cooperative Testing Initiative/Course 5: Mobility Gels/08 Vault Entrance/mention
- Cooperative Testing Initiative/Credits
- Cooperative Testing Initiative/es
- Cooperative Testing Initiative/fi
- Cooperative Testing Initiative/ru