| Map | Title | Author | Players | |
|---|---|---|---|---|
| CTF-OA-BRING_IT_2003 | OA-BRING_IT_2003 "OPPOSITES ATTRACT" | 10-16 | ||
| CTF-Oasis | CTF-Oasis | 12-20 | ||
| CTF-Oasis_of_Ra | Ra's Oasis | Unknown | ||
| CTF-Oblivion | Oblivion Cargo Freighter | 8 | ||
| CTF-OceanBaseBeta-2K3 | OceanBaseBeta2K3 | Unknown | ||
| CTF-OdiumCastle | CTF-GL-OdiumCastle | Unknown | ||
| CTF-Odysseon | Odysseon | 8-16 | ||
| CTF-Offering | Offering | 4-8 | ||
| CTF-ogivaseth | CTF-OGIVA][SETH | Unknown | ||
| CTF-OldCitySubway | Old-City-Subway | 4-6 | ||
| CTF-OldPyramids | CTF-OldPyramids | 4-16 | ||
| CTF-OldSkoolHallz-v1-0 | The Old Skool Hallz | 8-12 | ||
| CTF-Omaha_Beach | CTF-Omaha_Beach | 10 | ||
| CTF-OmegaFacility | Omega Facility | 10-16 | ||
| CTF-Ominous | Ominous Moon 2K3 | 8-16 | ||
| CTF-Ominous | Ominous | Unknown | ||
| CTF-Oneiros2k4 | The Oneiros Void | 8 | ||
| CTF-Online_Madness.ut2 | CTF-Online_Madness.ut2 | Unknown | ||
| CTF-OnreelTach | Onreel Tachnology | 8 | ||
| Ctf-Onyx | Onyx | Unknown | ||
| CTF-Opposite | Opposite | 8 | ||
| CTF-Opposite][ | Opposite | 8 | ||
| CTF-Oppressive_2k4 | CTF-Oppressive | 4 | ||
| CTF-Oraxin | Oraxin Installation | 8-14 | ||
| CTF-Oraxin-SE | Oraxin Installation | 8-14 | ||
| CTF-Orb2K3[Rev1] | CTF-Orb2K3 | 8-12 | ||
| CTF-Orb_1 | CTF-ORB_1_C13 | Unknown | ||
| CTF-Orbital | CTF-Orbital | Unknown | ||
| CTF-Orbital-Classic2k3 | Orbital Classic 2003 | Unknown | ||
| CTF-Orbital3 | Orbital3 | 4 | ||
| CTF-Orbital_Station2k4 | Orbital Station | Unknown | ||
| CTF-OrionStation-BETA | Orion Station | 8-16 | ||
| CTF-Orodruin | Orodruin | Unknown | ||
| CTF-Osiris2 | BR - Osiris Revision 2 | 16 | ||
| CTF-OSR-Gladius | Gladius | 8 | ||
| CTF-OSR-ZombieJuice | Errm... | 128-64 | ||
| CTF-OtherWorld | Other World | 8-4 | ||
| CTF-OtherWorld2007 | CTF-OtherWorld2007 | 4 | ||
| CTF-OutFlow | CTF-OutFlow | Unknown | ||
| CTF-OutFlow2004 | OutFlow 2004 | Unknown | ||
| CTF-OutFlow2004 | OutFlow 2004 | Unknown | ||
| CTF-Outlook2K3SE | Outlook][K3_SE | 8-16 | ||
| CTF-Outpost-33 | Outpost #33 | 10-16 | ||
| CTF-OverBurner2k4-Beta | OverBurner2k4 | Unknown | ||
| CTF-{o}-Phobos_Express | CTF-{ø}-Phobos_Express | 12-16 | ||
| CTF_optimal_warfareVER2 | Optimal Warfare | 8 |