- Conversion Gel
- Coomer (disambiguation)
- Coomer (scientist)
- Coomer (security guard)
- Core (disambiguation)
- Crab Synth
- Crack-Life
- Cremator
- Crossbow (disambiguation)
- Crowbar
- Cut car wrecks
- Damarcus Holbrook
- Dario Casali
- Dark Energy
- Dark Navy Volga GAZ-24 Wreck (Heavily Damaged)
- Dave Riller
- David Mertz
- David Speyrer
- DayHard
- Deathmatch (disambiguation)
- Dee Bradley Baker
- Defective Turret
- Delivery cart
- Demo Mesa
- Depot
- Desert Eagle
- Desert Launcher
- Design evolution of the Citadel
- Desk Employee
- Developer commentary
- Development History of Portal
- Development of Half-Life 2
- Development of the next Half-Life game
- Dhabih Eng
- Digger
- Directed Design Experiments
- Displacer Cannon
- Dock 137
- Dog
- Door Tower
- Doug Lombardi
- Doug Rattmann
- Douglas R. Wood
- Dr. Breen's Private Reserve
- Drawbridge
- Dreamcast items
- Drillpress
- Duncan and Scooter
- Dunn
- Dwight T. Barnes
- Dynamite
- Dystopia
- EMP Tool
- Earth
- Earth creatures
- Edgeless Safety Cube
- Egon
- Electric Zombie
- Eli Maxwell
- Eli Vance
- Elite Civil Protection
- Ellen McLain
- Emergency flare
- Emplacement Gun
- Employee Daycare Center
- Employers
- Energy Ball
- Energy Grenade
- Enrichment Center Test Subject Application Process
- Enrichment Shafts
- Enter the Freeman
- Entropy: Zero
- Entropy: Zero - Uprising
- Entropy: Zero 2
- Epistle Three
- Eric Kirchmer
- Erik Wolpaw
- Exile Vilify
- F-117 Nighthawk
- F-16 Fighting Falcon
- FIM-92 Stinger
- Fairview Junction
- FakeFactory's Cinematic Mod
- Fase
- Fast Headcrab
- Fast Walker
- Fast Zombie
- Female Assassin (disambiguation)
- Female Scientist
- Field Bridge
- Fire Extinguisher
- Flare Gun
- Flash Grenade
- Flashlight
- Flocking Floater
- Force Field
- Ford F-250
- Forklift
- Frankenturret
- Freeman's Mind
- Freight Yard
- Futbol
- GLaDOS
- GLaDOS' Song
- GLaDOS' testing track (Portal)
- GLaDOS' testing track (Portal 2)
- GLaDOS/Screen images
- GMC Vandura
- GR9
- Gabe Newell
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