- 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 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
- Azian Vance
- Azure Sheep
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