- Powered Combat Vest
- Powerup Bottles
- Project Borealis
- Propane Tank Launcher
- Propulsion Gel
- Prospero
- Protozoan
- Prrobot
- Pulse Minigun
- Pulse SMG
- Pulse Shield
- Pulse weapons
- Pursuit of Gordon Freeman
- Quarantine Zone
- Quiver Creature
- R-4913 and X-8973
- RAF-2203 Latvija Wreck
- RPG (disambiguation)
- Race X
- Radio (disambiguation)
- Radio Tower
- Raid on Black Mesa East
- Rail transport
- Randy Lundeen
- Randy Pitchford
- Ravenholm
- Ravenholm traps
- Razor Train
- Realm Lovejoy
- Reassembly Machine
- Reflection Gel
- Relaxation Vault
- Repulsion Gel
- Resin
- Resistance
- Resistance Crossbow
- Resistance RPG
- Resistance Truck
- Resistance communication
- Resonance Cascade
- Restrictor
- Retinal scanner
- Reviver
- Richard Keller
- Riller
- Riot Act
- Road transport
- Road vehicles
- Rob Heironimus
- Robert Culp
- Robert Guillaume
- Robo HEV
- Robot Enrichment
- Robot Grunt
- Rocket
- Rocket Sentry
- Rocks
- Roller Buddy
- Roller Turret
- Roller Wand
- Rollermine
- Ronald Hamrák
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