84 wads
| File | Name | Author | Iwad | Demos | Length |
|---|---|---|---|---|---|
| o34s | o34s | Lainos | doom2 | 1 | 1:10:24 |
| oatb | OOPS: All TechBase | Various | doom2 | 25 | 1:08:43 |
| obliv666 | obliv666 | Stormwalker | doom | 33 | 2:28:42 |
| oblivevil | Oblivious to Evil | Pseudonaut | doom | 2 | 3:26 |
| obsdm | Obsidian Deathmatch | Tempest | doom2 | 19 | 1:58 |
| obsidian | Hot Obsidian | Leon Kelz | doom2 | 1 | 3:57 |
| obtic11 | obtic11 | The Innocent Crew | doom2 | 50 | 7:12:20 |
| obzen | OBZEN | myolden | plutonia | 28 | 1:17:30 |
| occula | Occula | bemused & tourniquet | doom2 | 7 | 1:47:53 |
| ocean | ocean | Louigi Verona | doom2 | 4 | 3:31 |
| oceanbas | oceanbas | Brian Glines | doom2 | 3 | 8:09 |
| oceansde | Oceanside | Michael Jan Krizik (valkiriforce) | doom2 | 6 | 14:52 |
| octagon | octagon | Brian McKimens | doom | 2 | 7:23 |
| octo | octo | Unknown | doom | 3 | 1:02 |
| odam | odam | rf | doom | 1 | 5:46 |
| odark | odark | Varun Abhirama | doom | 3 | 10:59 |
| ode2dubzzz | Ode2dubzzz | SaladStream | doom2 | 191 | 3:50:52 |
| ode2impslayr | ode2impslayer | Various | doom2 | 134 | 4:15:09 |
| oderesuc | oderesuc | Jodwin | doom2 | 1 | 11:53 |
| odess_13 | odess_13 | Bob Evans | doom2 | 1 | 6:20 |
| odessa_1 | odessa_1 | Bob Evans | doom2 | 1 | 9:28 |
| odessa11 | odessa11 | Bob Evans | doom2 | 1 | 15:43 |
| odessa12 | odessa12 | Bob Evans | doom2 | 1 | 8:04 |
| odessa14 | odessa14 | Bob Evans | doom2 | 2 | 46:00 |
| odessa_2 | odessa_2 | Bob Evans | doom2 | 1 | 12:02 |
| odessa_3 | odessa_3 | Bob Evans | doom2 | 1 | 5:39 |
| odessa_6 | odessa_6 | Bob Evans | doom2 | 1 | 18:18 |
| odessa_7 | ODESSA 7 ("6 Keys of t... | Bob Evans | doom2 | 2 | 29:11 |
| odessa_9 | odessa_9 | Bob Evans | doom2 | 1 | 15:16 |
| odyssey | odyssey | Robert Chapman | doom2 | 2 | 6:39 |
| odyssey2 | odyssey2 | Myscha, the Sled Dog | doom2 | 8 | 35:46 |
| ohgodwhat | ohgodwhat | James Paddock | doom2 | 5 | 2:49 |
| ohm1 | OHM1 | Various | doom2 | 78 | 2:15:48 |
| ohm2 | OHM 2 | Various | doom2 | 57 | 1:19:27 |
| ohm2_2023_03 | OHM 2 | Various | doom2 | 2 | 59:28 |
| ohman | Oh, Man! | Marius | doom | 4 | 12:37 |
| oitl | Orange Is True Love | Ribbiks & Grain of Salt | doom2 | 29 | 2:17:30 |
| ojdoom2b | O.J. DOOM II (version ... | Wayne Poe | doom2 | 1 | 0:34 |
| oku2v31 | oku2v31 | Okuplok | doom2 | 8 | 28:44:02 |
| oman | oman | Stian Skjondal | doom2 | 3 | 5:57 |
| omega01 | omega01 | Tomi Rajala | doom2 | 16 | 51:24 |
| omega_ii | OMEGA2 | David Davidson | doom2 | 1 | 2:28 |
| omelet | omelet | Malcolm Sailor | doom2 | 4 | 6:50 |
| omgpump | omgpump | PumpkinSmasher | doom2 | 2 | 5:39 |
| omgpump2 | omgpump2 | PumpkinSmasher | doom2 | 1 | 6:11 |
| omnomnom | Om Nom Nom | D0M0 | doom2 | 1 | 4:35 |
| one-humanity | One Humanity | John Romero | doom2 | 8 | 29:24 |
| oneonone | oneonone | Rich J. Sham | doom2 | 4 | 12:00 |
| oneweek | oneweek | Various | doom2 | 42 | 10:15:55 |
| onslght | onslght | Henri Lehto | doom2 | 1 | 1:15 |
| oopsie | oopsie | Huy Pham | doom2 | 12 | 4:25 |
| op_801 | op_801 | Opulent | doom2 | 12 | 1:31:21 |
| openplan | openplan.wad | Dave Patrick | doom | 2 | 5:51 |
| ophase | ophase | Karthik Abhirama | doom2 | 5 | 8:52 |
| ophase2 | ophase2 | Karthik Abhirama | doom2 | 12 | 12:29 |
| ophase3 | ophase3 | Karthik Abhirama | doom2 | 15 | 24:40 |
| op-lite2 | op-lite2 | Stephen Clark | doom2 | 12 | 3:57:59 |
| opost21 | opost21 | Scott Amspoker | doom | 3 | 8:28 |
| oracle | oracle | Jim Flynn & Scott Harper | doom2 | 6 | 57:04 |
| orca | Orca | Jizzwardo | doom2 | 2 | 7:14 |
| ore15 | ore15 | Steve Johnson | doom2 | 2 | 0:26 |
| orifice | World Orifice | Benjogami | doom2 | 2 | 4:40:31 |
| origwad | origwad | Jeff Bird | doom | 50 | 30:26 |
| orin01 | orin01 | Orin Flaharty | doom2 | 3 | 4:04 |
| orpheus | orpheus | Shane | doom | 22 | 27:29 |
| oscl | oscl | Forli | doom2 | 2 | 18:53 |
| os-doa | os-doa | Philip Renshaw | doom2 | 2 | 38:54 |
| osiris | osiris | Glen Payne & Marshal Bostwick | doom2 | 6 | 27:37 |
| oskyrt | oskyrt | Hardcore_Gamer | doom | 2 | 14:40 |
| oskyrt2 | Beyond Horrible! | Hardcore_gamer | doom | 1 | 0:27 |
| osp | osp | Karthik Abhirama | doom | 2 | 12:09 |
| otakondm | otakondm | Mark Sachs | doom2 | 2 | 0:25 |
| ottawa09 | ottawa09 | Jean-Serge Gagnon | doom | 1 | 36:59 |
| outback | outback | Adam Windsor | doom2 | 1 | 2:21 |
| outpost2 | outpost2 | Radromity | doom2 | 6 | 3:29 |
| outposta | Outpost Alpha | odysseyofnoises | doom2 | 1 | 2:25 |
| outposta_2018 | Outpost Alpha | odysseyofnoises | doom2 | 2 | 4:22 |
| outposth | outposth | Rubber Duck | doom2 | 1 | 1:58 |
| overboard | Overboard | mouldy | doom2 | 222 | 11:37:57 |
| overflow | Overflow | Chris Kendell (Somniac) | doom2 | 2 | 3:34 |
| overload | Overload Deathmatches | Ola Bjorling | doom2 | 65 | 3:52 |
| oversat | Oversaturation | NoReason | doom2 | 11 | 16:16:24 |
| oxbow | oxbow | Tim Williams | doom2 | 1 | 4:04 |
| ozonia | Ozonia | Deadwing | doom2 | 112 | 3:33:37 |