| Title | Developer | Publisher(s) | Exclus. | Japan | Europe | North America |
|---|---|---|---|---|---|---|
| Oekaki Puzzle Battle Vol. 1: Yuusha-Oh GaoGaiGar Version[134] | Sunrise Interactive | Sunrise Interactive | ||||
| Oekaki Puzzle Battle: Kaiketsu Zorori Version[135] | Sunrise Interactive | Sunrise Interactive | ||||
| One Piece: Gear Spirit[136] | Matrix Software | Bandai Namco Games | Yes | |||
| Onegai My Melody[137] | TDK Core | TDK Core | ||||
| Oshare Majo Love cop Berry[138] | Sega | Sega | Yes | |||
| Open Season[10] | Ubisoft | Ubisoft | No | |||
| Osawari Tantei Ozawa Rina[139] | BeeWorks | Success | ||||
| Osu! Tatakae! Ouendan[2] | INIS | Nintendo | Yes | |||
| Otona straw vote Joushikiryoku Training DS[140] | Nintendo | Nintendo | Yes | |||
| Over the Hedge[141] | Vicarious Visions | Activision | No | |||
| Over The Hedge: Hammy Goes Nuts[142] | Amaze Entertainment | Activision | No |