| Title | Description | Size |
| OpenBOR | Game engine for PSP | 11 MB |
| Open Mugen P | Version of Mugen for PSP. | 2 MB |
| Open Gladiat | Homebrew game for PSP. | 4 MB |
| OMGWTFOTL | PSP port of Odious Manly Genuflection With Terrible Fury: Only T | 28 MB |
| Old Miner | Homebrew game for PSP. | 2 MB |
| Odyssey For | Homebrew game for PSP. | 3 MB |
| OceanPop | Homebrew puzzle game for PSP. | 14 MB |
| Obstacle | Simple dodging game for PSP. | 8 MB |
| O.T.T.F. | Puzzle game for PSP. | 4 MB |
| NyanCat Mod | NyanCat Mod of Platform Portable. | 874 KB |
| Numpty Physi | PSP version of the indie game. | 728 KB |
| Numeros | Homebrew game for PSP. | 2 MB |
| NumberSet PS | Puzzle game for PSP. | 292 KB |
| Nuke The Wha | Homebrew game for PSP. | 3 MB |
| Ntrok | Homebrew game for PSP based on KTron. | 1 MB |
| nothing.seri | Homebrew game for PSP. | 5 MB |
| Not Trust | Homebrew game for PSP. | 11 MB |
| Not Another | Homebrew game for PSP. | 13 MB |
| NORT | Two-player homebrew game for PSP. | 3 MB |
| Noodle Box! | A Puzzle (almost-)game that plays like a mix between Snake and T | 900 KB |
| NOIZ2SA | PSP port of the vertical shooter developed by Kenta Cho. | 9 MB |
| NOeSIS02 for | PSP port of the freeware visual novel "NOeSIS 02 -羽化-". | 110 MB |
| NOeSIS00～0 | PSP port of the freeware visual novel "NOeSIS～嘘を吐いた� | 121 MB |
| No Gravity D | Playable demo for No Gravity, created by the homebrew group Real | 31 MB |
| No Bugs Allo | 3D shooter game for PSP. | 4 MB |
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