- 1500 Megawatt Aperture Science Heavy Duty Super-Colliding Super Button
- 314 URB-LOC 0017 Advisor
- AH-64 Apache
- AK-47
- APC garage
- AR3
- ARG (disambiguation)
- ATLAS and P-body
- Aaron Barber
- Absolute Redemption
- Achievements (disambiguation)
- Adam Baldwin
- Adhesion Gel
- Adrian Shephard
- Advanced Biological Research Lab
- Advanced Knee Replacement
- Advisor Container
- Advisor Platform
- Advisor Pod
- Afraid of Monsters: Director's Cut
- AirEx Truck
- Airboat
- Alien Aircraft
- Alien Assassin
- Alien Combine Soldier
- Alien Controller
- Alien Fauna
- Alien Grunt
- Alien Quarantine Labs
- All-Knowing Vortigaunt
- Alyx's Apartment
- Alyx's Gun
- Alyx Vance
- Alésia Glidewell
- Andrea Wicklund
- Animal King
- Annabelle
- Anti-Mass Spectrometer
- Anticitizen
- Antlion
- Antlion Detector
- Antlion Egglayer
- Antlion Grub
- Antlion Guard
- Antlion Guardian
- Antlion Hill
- Antlion King
- Antlion Rollergrub
- Antlion Soldier
- Antlion Worker
- ApertureScience.com
- Aperture (disambiguation)
- Aperture Desk Job
- Aperture Hand Lab
- Aperture Science
- Aperture Science Aerial Faith Plate
- Aperture Science Announcement System
- Aperture Science Bomb
- Aperture Science Collaborative Disposition Test
- Aperture Science Cooperative Testing Initiative (disambiguation)
- Aperture Science Core Input Receptacle
- Aperture Science Crusher
- Aperture Science Cube Button
- Aperture Science Edgeless Safety Cube Receptacle
- Aperture Science Emergency Intelligence Incinerator
- Aperture Science Enrichment Center
- Aperture Science Excursion Funnel
- Aperture Science Extended Relaxation Annex
- Aperture Science Extended Relaxation Center
- Aperture Science Handheld Portal Device
- Aperture Science Hard Light Bridge
- Aperture Science High Energy Pellet
- Aperture Science Laser Field
- Aperture Science Material Emancipation Grill
- Aperture Science Military Android
- Aperture Science Multitasking Arm
- Aperture Science Panel
- Aperture Science Personality Construct
- Aperture Science Pipe Network
- Aperture Science Pneumatic Diversity Vent
- Aperture Science Radio
- Aperture Science Robot Worker
- Aperture Science Security Camera
- Aperture Science Sentry Turret
- Aperture Science Shredder
- Aperture Science Speaker System
- Aperture Science Switch
- Aperture Science Unstationary Scaffold
- Aperture Science Vital Apparatus Vent
- Aperture Science Weighted Pivot Cube
- Aperture Science Weighted Storage Cube
- Archer
- Area 8 Topside Dormitories
- Armor vest and helmet
- Armored Headcrab
- Armored Personnel Carrier
- Armored Zombie
- Arne Magnusson
- Assassin (disambiguation)
- Assault Synth
- Attack Synth
- Attack on Nova Prospekt
- Attack on White Forest
- Autogun
- Avia A31 Wreck
- Axon Pariah
- Azian Vance
- Azure Sheep
- Backhoe
- Backman (disambiguation)
- Bahl (disambiguation)
- Bailey (disambiguation)
- Banjo and Kazooie
- Barge
- Barn Advisor
- Barnacle
- Barnacle Grapple
- Barney's Scout
- Barney Calhoun
- Battery
- Battle of City 17
- Ben Houge
- Bench Vice
- Beyond Black Mesa
- Bill Van Buren
- Binoculars (cut item)
- Binoculars (disambiguation)
- Biological Waste Processing Plant
- Bird (Portal 2)
- Black Hole Gun
- Black Mesa
- Black Mesa: Classic
- Black Mesa (disambiguation)
- Black Mesa (game)
- Black Mesa Air Control
- Black Mesa Announcement System
- Black Mesa Ceiling Turret
- Black Mesa Crossbow
- Black Mesa East
- Black Mesa Engineers
- Black Mesa Inbound
- Black Mesa Incident
- Black Mesa Medical Lab
- Black Mesa Personnel
- Black Mesa Research Facility
- Black Mesa SUV
- Black Mesa Science Team
- Black Mesa Security Force
- Black Mesa South Access
- Black Mesa Transit System
- Black Mesa desert
- Black Mesa truck
- Black Ops
- Black Ops Mortar
- Bloody Headcrab
- Bloody Headcrab Zombie
- Blue Portals
- Blue Volkswagen Golf Wreck (Heavily Damaged)
- Boid
- Borealis
- Borealis (cut location)
- Borealis Workers
- BreenGrub
- Breencast
- Brett Johnson
- Brian Hess
- Brickbat
- Bridge Point
- Bullsquid
- C-130
- Cake
- Canals
- Car battery
- Caroline
- Cavanaugh
- Cave Johnson
- Central AI Chamber
- Chamber Lock
- Charger
- Charger (Xen creature)
- Chef Vortigaunt
- Chell
- Chet Faliszek
- Chevrolet Caprice
- Children
- Chris Jensen
- Chuck Jones
- Chumtoad
- Citadel
- Citadel Core
- Citizen
- City 11
- City 12
- City 13
- City 14
- City 15
- City 16
- City 17
- City 17: Episode One
- City 17 Trainstation
- City 17 Trainstation (disambiguation)
- City 17 Underground
- City 24
- City 27
- City 8
- City Scanner
- Civil Protection
- Civil Protection (series)
- Cleansing Gel
- Cleansuit
- Cloaking device
- Co-op Test Shaft
- Coast Raids
- Codename: Gordon
- Colette Green
- Colt Python
- Combat Knife
- Combine
- Combine Advisor
- Combine Assassin
- Combine Assassin tank
- Combine Barricade
- Combine Big Momma Pod
- Combine Binoculars
- Combine Bunker
- Combine Camera
- Combine Ceiling Turret
- Combine Cell
- Combine Charger
- Combine Destiny
- Combine Dispenser
- Combine Dropship
- Combine Elevator
- Combine Elite (Beta)
- Combine Emitter
- Combine Fabricator
- Combine Factories
- Combine Female Sniper
- Combine Grenade
- Combine Ground Turret
- Combine Grunt
- Combine Guard
- Combine Guard Gun
- Combine Gunship
- Combine Heavy Door
- Combine Interface
- Combine Killer
- Combine Laser Tripmine
- Combine Launcher
- Combine Light
- Combine Mobile Mine
- Combine Monitor
- Combine Ordinal
- Combine Overworld
- Combine Power Generator
- Combine Prisoner Transport
- Combine SWAT Truck
- Combine Security Door
- Combine Sentry Gun
- Combine Shotgun
- Combine Smart Barrier
- Combine Sniper Elite
- Combine Squad Formations
- Combine Super Soldier
- Combine Suppressor
- Combine Synth Elite Soldier
- Combine Wall Turret
- Combine Watchtower
- Combine guard (Civil Protection)
- Combine imagery
- Combine lock
- Combot
- Concerned: The Half-Life and Death of Gordon Frohman
- Confiscation Field
- Conscripts
- Consoling Couple
- Construction Worker
- Contraption Cube
- 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
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