- Mark IV Thermonuclear Device
- Martel
- Mary Kae Irvin
- Matthew Armstrong
- Maxiron and Jakerockwell
- Medkit
- Mel
- Memory Replacement
- Merkava
- Merle Dandridge
- Mertz (disambiguation)
- Mertz (scientist)
- Michael Avon Oeming
- Michael Shapiro
- Michelle Forbes
- Mike Harrington
- Mike Morasky
- Mike Patton
- Mil Mi-8
- Military Police
- Miller
- Minigun
- Minor Aperture Science employees
- Minor Black Mesa employees
- Minor HECU members
- Minor Resistance members
- Mishaps in the Reactor Chamber
- Missing Information
- Mistake of Pythagoras
- Mk 2 Grenade
- Mobility Gel
- Moby Francke
- Mods
- Molotov Cocktail
- Monorail (disambiguation)
- Moon
- Mortar Synth
- Mr. Chubby Beak
- Mr. Friendly
- Mr. Valve
- Multiverse
- Muscle Car
- NECA Gordon Freeman Action Figure
- Nanobot
- Narbacular Drop
- Navy Blue Moskvitch 2140 Wreck (Heavily Damaged)
- NeoTokyo
- Neurotoxin Generator
- New Little Odessa
- Newell (disambiguation)
- Newell (scientist)
- Nigel
- Nihilanth
- Nolan North
- Northern Star
- Nova Prospekt
- Obsidian Conflict
- Odell
- Odessa Cubbage
- Olga
- Operation: Black Mesa
- Oracle Turret
- Ordinance Storage Facility (disambiguation)
- Otis Laurey
- Outland Generator
- Outside Aperture
- Overwatch
- Overwatch Elite
- Overwatch Nexus
- Overwatch Sniper
- Overwatch Sniper Rifle
- Overwatch Soldier
- Overwatch Standard Issue Pulse Rifle
- Overwatch Voice
- Oxygen Bottles
- Panther Eye
- Paranoia
- Paranoia 2: Savior
- Particle Storm
- Party Escort Bot
- Peer Review
- Peer Review (Mod)
- Penguin
- Perpetual Testing Initiative
- Peters (cut character)
- Petroleum Station
- Pheropods
- Physgun
- Pipe
- Pipe Wrench
- Pistol (disambiguation)
- Pit Drone
- Pit Worm
- Pitchford (disambiguation)
- Poison Headcrab
- Poison Zombie
- Polyrobo
- Portal
- Portal: First Slice
- Portal: Prelude
- Portal: Still Alive
- Portal: The Flash Version
- Portal: The Flash Version MapPack
- Portal (disambiguation)
- Portal 2
- Portal 2: Lab Rat
- Portal 2 Achievements and Trophies
- Portal 2 soundtrack
- Portal 2 storyline
- Portal ARG
- Portal Achievements
- Portal Funneling
- Portal Reloaded
- Portal Stories: Mel
- Portal Storm
- Portal soundtrack
- Portal storyline
- PotatoFoolsDay ARG
- Powered Combat Vest
- Powerup Bottles
- Project Borealis
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