- Tbot1
- Technical Trainstation
- Ted Backman
- Ted Kosmatka
- Teleportation
- Television
- Tentacle
- Test Chamber (disambiguation)
- Test Shaft 09
- Test Subject
- Test Subject 042
- Test Subject 234
- Testing track
- The Citizen
- The Coast
- The Combine Vault Heist
- The Consul
- The Final Hours of Half-Life: Alyx
- The Final Hours of Portal 2
- The Fisherman
- The G-Man
- The Lab
- The Mesa Times
- The National
- The Orange Box
- The Orange Box Achievements
- The Orange Box Cheats
- The Orange Box soundtrack
- The Outlands
- The Specialists
- The Terminal
- The Uprising
- The Vault
- The Wasteland
- The White Forest Inn
- Thermal Discouragement Beam
- They Hunger
- Thumper (disambiguation)
- Tier 3
- Timeline of the Half-Life universe
- Tony Todd
- Topside Motorpool
- Trabant 601 Car Wreck (Heavily Damaged)
- Trainstation (disambiguation)
- Tramcar
- Transponder
- Tri Nguyen
- Tripmine (disambiguation)
- Tripod Hopper
- Tristan Reidford
- Turret Manufacturing
- Turret Opera
- USP Match
- USS Darkstar
- Uiy
- Underground Railroad
- Unidentified Quiver Creature
- Unidentified deaf character
- Unnamed Scientist
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