- 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
- Urban Chaos
- Uriah
- V-22 Osprey
- V35 Rocket Launcher
- Valve Corporation
- Valve Hammer Editor
- Vance
- Vance (disambiguation)
- Vault (disambiguation)
- Victory Lift
- Victory Mine
- Victory Mine Vortigaunt
- Viktor Antonov
- Voltigore
- Vortex Hopwire
- Vorti-Cell
- Vortigaunt
- Vortigaunt Camp
- Vortigese
- Wallace Breen
- Walter Bennet
- Want You Gone
- Wanted!
- Waste Processing Area 3
- Wasteland Scanner
- Watermelon (prop)
- Weapon Box
- Weapons cut from Half-Life 2
- Weekday Warrior
- Welding Torch
- Wheatley
- Wheatley's testing track
- Whistler
- White & Pink Trabant 601 Wreck
- White & Yellow Moskvitch 2140 Wreck
- White Forest
- Wilson Chronicles
- Workers
- XM29 OICW
- Xen
- Xen Ceiling Turret
- Xen Fungus
- Xen Grenade
- Xen Healing Pool
- Xen Healing Shower
- Xen Sentry Cannon
- Xen Thumper
- Xen Trampoline
- Xen Tree
- Xen crystal
- Yatsze Mark
- Year of the Dragon
- Zero Point Energy Field Manipulator
- Zero Point Generator
- Zombie
- Zombie Assassin
- Zombie Panic! Source
- Zombine
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