Series

• Ogre Battle
• OlliOlli
• Omega Labyrinth
• OneeChanbara
• One Must Fall
• One Piece
• One Piece
• One Piece
• One Piece: Grand Battle
• One Piece: Pirate Warriors
• One Piece: Unlimited
• One Piece: Unlimited Cruise
• Oni Chichi
• Onimusha
• On the Ball
• Operation Flashpoint
• Oppai Slider
• Oreimo
• Ori
• Orwell
• Osomatsu-san
• Osu! Tatakae! Ouendan
• Otogi
• Otomedius
• Outlast
• Outlaw Golf
• Out of the Park Baseball
• Out Run
• Outward
• Overcooked!