- 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)
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