- Ochigee Designer Tsukutte Pon! (Japan)
- Off-World Interceptor Extreme (Europe) - TODO
- Off-World Interceptor Extreme (Japan) - TODO
- Off-World Interceptor Extreme (USA)
- Oh-chan no Oekaki Logic (Japan)
- Ojousama Tokkyuu (Japan)
- Ojousama o Nerae!! (Japan)
- Okudera Yasuhiko no Sekai o Mezase! Soccer Kids - Nyuumon-hen (Japan)
- Olympic Soccer (Europe) - TODO
- Olympic Soccer (Germany) - TODO
- Olympic Soccer (Japan) - TODO
- Olympic Soccer (USA)
- Omakase! Savers (Japan)
- OoEdo Renaissance (Japan)
- Oracle no Houseki - Jewels of the Oracle (Japan)
- Ousama Game (Japan)
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