Half-Life: Opposing Force
Half-Life: Opposing Force mods
A mod changes the game itself. It needs something to load it, it may need other mods first, and it only works on the versions its author built it for.
739 mods · newest update 18 Sep 2026
- op4_outpostalby GuestMaps / Deathmatchupdated 3 y ago
- Hysteriaby GuestMaps / Deathmatchupdated 3 y ago
- op4_evilelves - Evil Elves!by GuestMaps / Deathmatchupdated 3 y ago
- Classicby GuestMaps / Deathmatchupdated 3 y ago
- op4_goddardgibsby GuestMaps / Deathmatchupdated 3 y ago
- XenDMby GuestMaps / Deathmatchupdated 21 mo ago
- Over The Edgeby GuestMaps / Deathmatchupdated 3 y ago
- Total Destructionby GuestMaps / Deathmatchupdated 3 y ago
- Minecart Cavernby GuestMaps / Deathmatchupdated 3 y ago
- Retroactiveby GuestMaps / Deathmatchupdated 3 y ago
- Jungleby GuestMaps / Deathmatchupdated 3 y ago
- Spindleby GuestMaps / Deathmatchupdated 20 mo ago
- Slayer's Pit 2by GuestMaps / Deathmatchupdated 21 mo ago
- Xbounce 2by GuestMaps / Deathmatchupdated 21 mo ago
- Night Opsby GuestMaps / Deathmatchupdated 3 y ago
- Assaultby GuestMaps / Deathmatchupdated 18 mo ago
- Ancient Arenaby GuestMaps / Deathmatchupdated 3 y ago
- Acidby GuestMaps / Deathmatchupdated 2 y ago
- Zeroceromonby Ring-A-Ding RampageMaps / Capture the Flagupdated 3 y ago
- Storage Areaby Ring-A-Ding RampageMaps / Capture the Flagupdated 3 y ago
- Kontitby GuestMaps / Deathmatchupdated 3 y ago
- Fixed / Timeline-Accurate Skyboxesby BloxedMaps / Other/Miscupdated 3 y ago
- Fixed of3a1b Titleby MisfiredNoobResourcesupdated 3 y ago
- op4_corridors_collideby dr.ColaMaps / Deathmatchupdated 3 y ago
- op4_stalkyard_dmby DrogolhusMaps / Deathmatchupdated 3 y ago
- op4_old_infernoby MAXTER_SNAKEMaps / Deathmatchupdated 3 y ago
- Bad Half-Life Map #3 Op4 Edition: "Snow.BSP"by JulietFucks09Maps / Other/Miscupdated 3 y ago
- Azure Sheep Just Barney cameoby ShadowysnSingle Playerupdated 3 y ago
- op4_chavesby DrogolhusMaps / Deathmatchupdated 3 y ago
- op4_tripminesby ERRORCODE0X7AMaps / Deathmatchupdated 3 y ago
- Fallback, Fire, and Iceby GuestSingle Playerupdated 3 y ago
- The Xen Campaignsby GuestSingle Playerupdated 3 y ago
- Ground Zeroby GuestSingle Playerupdated 3 y ago
- A Soldiers Taleby GuestSingle Playerupdated 3 y ago
- Ground Zero 2 - Falloutby GuestSingle Playerupdated 3 y ago
- Retaliationby GuestSingle Playerupdated 3 y ago
- Dark Operationsby GuestSingle Playerupdated 3 y ago
- Snowy Rock, Part 1by DemalitionSingle Playerupdated 3 y ago
- Bootleg Squadrogby GuestSingle Playerupdated 3 y ago
- Double Helixby GuestSingle Playerupdated 3 y ago
- Supernova Space Stationby GuestSingle Playerupdated 3 y ago
- Mission Impossibleby GuestSingle Playerupdated 3 y ago
- Klabautermannby GuestSingle Playerupdated 3 y ago
- Without Doubtsby GuestSingle Playerupdated 3 y ago
- Warzoneby GuestSingle Playerupdated 3 y ago
- Operation: Sandblastby GuestSingle Playerupdated 3 y ago
- Little Skyscraper of Horrorsby GuestSingle Playerupdated 3 y ago
- Footholdby GuestSingle Playerupdated 3 y ago
739 mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.