| One Must Fall: Battlegrounds (2003) | 89,411 | 22 |
| One Night at Flumpty's (2015) | 237,774,926 | 6,509 |
| One Night at Flumpty's 3 (2021) | 136,145,760 | 4,073 |
| One Night Stand (2016) | 44,419,583 | 1,497 |
| One Night With Stalin (2022) | 16,675 | 26 |
| One night, Hot springs (2018) | 276,183 | 252 |
| One on One: Dr. J vs. Larry Bird (1983) | 147,414 | 80 |
| One Person Story (2018) | 10,971 | 23 |
| One Piece (2005) | 7,450,216 | 1,903 |
| One Piece - Nanatsu Shima no Daihihou (2002) | 23,219 | 24 |
| One Piece Bounty Rush (2018) | 304,812,938 | 72,356 |
| One Piece Grand Battle! 3 (2003) | 872,492 | 326 |
| One Piece Mansion (2001) | 1,164,770 | 111 |
| One Piece Odyssey (2023) | 89,117,865 | 52,550 |
| One Piece Treasure Battle! (2002) | 337,134 | 196 |
| One Piece Treasure Cruise (2014) | 196,743,303 | 32,920 |
| One Piece Unlimited Cruise 1 Wii (2008) | 1,338 | 14 |
| One Piece Unlimited Cruise: Episode 2 (2009) | 2,981,848 | 539 |
| One Piece: Become the Pirate King! (2000) | 694,355 | 43 |
| One Piece: Burning Blood (2016) | 210,050,041 | 24,758 |
| One Piece: Chopper no Daibouken (2003) | 17,476 | 19 |
| One Piece: Dai Kaizoku Colosseum (2016) | 1,133,921 | 199 |
| One Piece: Doragon Doriimu! (2005) | 35,387 | 21 |
| One Piece: Gear Spirit (2007) | 2,408,889 | 155 |
| One Piece: Gigant Battle! 2 - New World (2011) | 1,049,369 | 381 |
| One Piece: Going Baseball - Kaizoku Yakyuu (2004) | 3,747,759 | 52 |
| One Piece: Grand Adventure (2006) | 3,963,556 | 2,608 |
| One Piece: Grand Battle Swan Colosseum (2002) | 228,541 | 119 |
| One Piece: Grand Battle! (2005) | 5,427,989 | 2,547 |
| One Piece: Grand Cruise (2018) | 2,156,097 | 178 |
| One Piece: Great Pirate Colosseum (2016) | 0 | 0 |
| One Piece: Maboroshi no Grand Line Boukenki (2002) | 38,447 | 92 |
| One Piece: Niji no Shima Densetsu (2001) | 4,114 | 9 |
| One Piece: Ocean's Dream (2003) | 31,630 | 21 |
| One Piece: Pirate Warriors (2012) | 93,113,145 | 21,967 |
| One Piece: Pirate Warriors 2 (2013) | 47,472,082 | 7,413 |
| One Piece: Pirate Warriors 3 (2015) | 134,693,639 | 31,442 |
| One Piece: Pirate Warriors 4 (2020) | 327,401,436 | 75,052 |
| One Piece: Pirates' Carnival (2005) | 823,288 | 306 |
| One Piece: Romance Dawn (2012) | 5,215,742 | 2,354 |
| One Piece: Round the Land (2004) | 572,048 | 547 |
| One Piece: Super Grand Battle! X (2014) | 2,852,206 | 236 |
| One Piece: Thousand Storm (2016) | 19,304,494 | 6,470 |
| One Piece: Treasure Wars (2002) | 45,049 | 35 |
| One Piece: Treasure Wars 2 - Welcome to Buggyland (2002) | 28 | 2 |
| One Piece: Unlimited Adventure (2007) | 7,937,737 | 1,183 |
| One Piece: Unlimited Cruise (2008) | 8,394,945 | 1,826 |
| One Piece: Unlimited Cruise SP (2011) | 2,533,484 | 224 |
| One Piece: Unlimited World Red (2013) | 44,830,868 | 7,896 |
| One Piece: World Seeker (2019) | 103,563,313 | 20,283 |
| One Piece: Yume no Lufy Kaizokudan Tanjou (2001) | 27,356 | 88 |
| One Punch Man: A Hero Nobody Knows (2020) | 242,927,832 | 10,161 |
| One Shell Straight to Hell (2021) | 623,917 | 97 |
| One Step After Fall (2022) | 71,711 | 139 |
| One Step From Eden (2020) | 7,826,343 | 5,328 |
| One Strike (2017) | 596,860 | 273 |
| One Thousand Lies (2016) | 24,005 | 333 |
| One Troll Army (2016) | 3,010,861 | 322 |
| One True Hero (2022) | 274,359 | 189 |
| One Way Heroics (2012) | 1,506,599 | 2,271 |
| One Way To Die (2015) | 7,694 | 22 |
| The One We Found (2018) | 118,523 | 69 |
| One Wheel Guy (2022) | 108,874 | 24 |
| The one who pulls out the sword will be crowned king (2022) | 8,692,928 | 534 |
| One-armed cook (2022) | 20,536,328 | 5,031 |
| One-Eyed Lee and the Dinner Party (2019) | 33,016 | 91 |
| Onechanbara Origin (2019) | 493,100 | 472 |
| Onechanbara Z2: Chaos (2014) | 10,136,969 | 4,984 |
| Onechanbara: Bikini Samurai Squad (2006) | 850,933 | 499 |
| OneChanbara: Bikini Zombie Slayers (2008) | 1,648,151 | 428 |
| Onee Chanbara ORIGIN (2020) | 823,086 | 1,492 |
| Onefog Xonix (2002) | 382 | 1 |
| Onegai Monster (1999) | 4,786 | 13 |
| Oneiric Garden (2014) | 10 | 1 |
| OnEscapee (1997) | 83,594 | 45 |
