Otome-teki Koi Kakumei – Love Revo!! DS (Japan)

Odoru Daisousa-sen – The Game – Sensuikan ni Sennyuu Seyo! (Japan)

Otona no DS Golf (Japan)

Otona Ryoku Kentei (Japan)

Ontama – Onpu-tou Hen (Japan)

Othello de Othello DS (Japan)

Ochaken no Heya DS 2 (Japan) (Rev 1)

Over the Hedge – Hammy Goes Nuts! (Europe)

Otona no DS Mystery – Izumi Jiken File (Japan)

Ochaken no Heya DS 3 (Japan)

Oshiri Kajiri Mushi no Rhythm Lesson DS – Kawai Ongaku Kyoushitsu Kanshuu (Japan)

Oden-kun – Tanoshii Oden Mura (Japan)

Operation – Vietnam (Germany)

Oshare Princess – Oshare ni Koishite (Japan)

Ochaken no Daibouken 2 – Yume Ippai no Omocha Bako (Japan)

Otona no Onna Ryoku Kentei (Japan)

Oekaki Puzzle Battle! – Yuusha Ou GaoGaiGar Hen (Japan)

Over the Hedge – Beesten bij de Buren (Netherlands)

Oni Zero – Sengoku Ranse Hyakka Ryouran (Japan)

Obunsha Deru-jun – Chiri DS (Japan)

Ogwangui Darin DS (Korea)

Obunsha Deru-jun – Koumin DS (Japan)

Okada Toshio no Itsumademo Debu to Omounayo – DS de Recording Diet (Japan)

Onsei Kanjou Sokuteiki – Kokoro Scan (Japan)