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One Piece – Gigant Battle! (Japan)
One Piece – Gigant Battle! (Germany)
One Piece – Gigant Battle! (France)
One Piece – Gigant Battle! (Europe)
One Piece – Gear Spirit (Korea)
One Piece – Gear Spirit (Japan)
OMG 26 – Our Mini Games (USA)
Oktoberfest – The Official Game (Europe) (En,Fr,De,Es,It)
Okaeri! Chibi-Robo! – Happy Rich Oosouji! (Japan)
Okada Toshio no Itsumademo Debu to Omounayo – DS de Recording Diet (Japan)
OK! – First for Celebrity News – Puzzle Stars (Europe)
Ojaru-Maru DS – Ojaru to Okeiko Aiueo (Japan)
Oishinbo – DS Recipe Shuu (Japan)
Oishiku Kiwameru Shokutsuu DS – Otona no Shuumatsu Henshuubu Gensen no Osusume Omise Jouhou Iri (Japan)
Oide yo Doubutsu no Mori (Japan) (Rev 1)
Oide yo Doubutsu no Mori (Japan)
Ohimesama Debut (Japan)
Oheya o Kazarou – Koinu no Heya (Japan)
Ogwangui Darin DS (Korea)
Oekaki Puzzle Battle! – Yuusha Ou GaoGaiGar Hen (Japan)
Odoru Daisousa-sen – The Game – Sensuikan ni Sennyuu Seyo! (Japan)
Oden-kun – Tanoshii Oden Mura (Japan)
Ochaken no Heya DS 4 (Japan)
Ochaken no Heya DS 3 (Japan) (Rev 1)
Ochaken no Heya DS 3 (Japan)
Ochaken no Heya DS 2 (Japan) (Rev 1)
Ochaken no Heya DS 2 (Japan)
Ochaken no Heya DS (Japan)
Ochaken no Daibouken 2 – Yume Ippai no Omocha Bako (Japan)
Ochaken no Daibouken – Honwaka Yumemiru Sekai Ryokou (Japan)
Obunsha Deru-jun – Sansuu DS (Japan)
Obunsha Deru-jun – Rika DS (Japan)
Obunsha Deru-jun – Rekishi DS (Japan)
Obunsha Deru-jun – Koumin DS (Japan)
Obunsha Deru-jun – Kokugo DS (Japan)
Obunsha Deru-jun – Chiri DS (Japan) (Rev 1)