| One More Dungeon (2015) | 391,163 | 324 |
| One More Dungeon 2 (2022) | 313,726 | 238 |
| One More Gate : A Wakfu Legend (2022) | 468,350 | 415 |
| One More Island (2022) | 350,406 | 201 |
| One More Line (2014) | 399,172 | 96 |
| One More Shooter Game (2023) | 476 | 6 |
| One Must Fall: 2097 (1994) | 1,377,985 | 578 |
| One Must Fall: Battlegrounds (2003) | 82,520 | 22 |
| One Night at Flumpty's (2015) | 303,648,919 | 7,735 |
| One Night at Flumpty's 3 (2021) | 132,306,954 | 3,809 |
| One Night in Kawami (2024) | 0 | 0 |
| One Night Stand (2016) | 65,186,499 | 1,402 |
| One Night With Stalin (2022) | 13,637 | 26 |
| One Night You're Crazy (2017) | 0 | 0 |
| One Night ~Young Bride for One Night (2024) | 930 | 2 |
| One night, Hot springs (2018) | 276,808 | 234 |
| One Night: Burlesque (2023) | 18,495 | 24 |
| One on One: Dr. J vs. Larry Bird (1983) | 142,395 | 69 |
| One Person Story (2018) | 7,669 | 23 |
| One Piece (2005) | 2,205,199 | 1,776 |
| One Piece - Nanatsu Shima no Daihihou (2002) | 24,904 | 28 |
| One Piece Bounty Rush (2018) | 332,986,384 | 80,674 |
| One Piece Grand Battle! 3 (2003) | 991,199 | 451 |
| One Piece Mansion (2001) | 1,103,430 | 96 |
| One Piece Odyssey (2023) | 99,144,844 | 54,895 |
| One Piece Treasure Battle! (2002) | 342,626 | 201 |
| One Piece Treasure Cruise (2014) | 191,685,245 | 32,908 |
| One Piece Unlimited Cruise 1 Wii (2008) | 3,281 | 22 |
| One Piece Unlimited Cruise: Episode 2 (2009) | 3,930,450 | 465 |
| One Piece: Become the Pirate King! (2000) | 23,067 | 35 |
| One Piece: Burning Blood (2016) | 200,672,939 | 24,930 |
| One Piece: Chopper no Daibouken (2003) | 18,740 | 17 |
| One Piece: Dai Kaizoku Colosseum (2016) | 887,380 | 107 |
| One Piece: Doragon Doriimu! (2005) | 34,976 | 19 |
| One Piece: Gear Spirit (2007) | 2,333,801 | 160 |
| One Piece: Gigant Battle! 2 - New World (2011) | 1,124,410 | 491 |
| One Piece: Going Baseball - Kaizoku Yakyuu (2004) | 3,750,477 | 52 |
| One Piece: Grand Adventure (2006) | 3,921,313 | 2,743 |
| One Piece: Grand Battle Swan Colosseum (2002) | 232,249 | 124 |
| One Piece: Grand Battle! (2005) | 5,588,154 | 2,814 |
| One Piece: Grand Cruise (2018) | 2,228,404 | 164 |
| One Piece: Great Pirate Colosseum (2016) | 407,793 | 139 |
| One Piece: Maboroshi no Grand Line Boukenki (2002) | 38,753 | 92 |
| One Piece: Niji no Shima Densetsu (2001) | 4,331 | 10 |
| One Piece: Ocean's Dream (2003) | 32,991 | 29 |
| One Piece: Pirate Warriors (2012) | 98,978,488 | 21,258 |
| One Piece: Pirate Warriors 2 (2013) | 54,638,302 | 8,106 |
| One Piece: Pirate Warriors 3 (2015) | 163,189,154 | 36,049 |
| One Piece: Pirate Warriors 4 (2020) | 512,682,020 | 98,668 |
| One Piece: Pirates' Carnival (2005) | 545,987 | 368 |
| One Piece: Romance Dawn (2012) | 4,826,068 | 2,302 |
| One Piece: Round the Land (2004) | 644,811 | 569 |
| One Piece: Super Grand Battle! X (2014) | 2,769,400 | 229 |
| One Piece: Thousand Storm (2016) | 18,709,031 | 6,104 |
| One Piece: Treasure Wars (2002) | 17,270 | 20 |
| One Piece: Treasure Wars 2 - Welcome to Buggyland (2002) | 3,540 | 9 |
| One Piece: Unlimited Adventure (2007) | 8,619,834 | 1,248 |
| One Piece: Unlimited Cruise (2008) | 7,424,457 | 1,878 |
| One Piece: Unlimited Cruise SP (2011) | 2,477,353 | 233 |
| One Piece: Unlimited World Red (2013) | 44,011,617 | 8,328 |
| One Piece: World Seeker (2019) | 92,531,698 | 20,504 |
| One Piece: Yume no Lufy Kaizokudan Tanjou (2001) | 22,438 | 77 |
| One Punch Man: A Hero Nobody Knows (2020) | 112,776,067 | 10,478 |
| One Room Dungeon (2025) | 27,635 | 33 |
| One S'More (2024) | 298 | 9 |
| One Shell Straight to Hell (2021) | 625,005 | 92 |
| One Socket (2024) | 69,718 | 15 |
| One Step After Fall (2022) | 72,521 | 193 |
| One Step From Eden (2020) | 6,077,702 | 5,342 |
| One Strike (2017) | 476,901 | 250 |
| One Tank Army (2023) | 39 | 1 |
| One Thousand Lies (2016) | 23,852 | 344 |
| One Troll Army (2016) | 2,941,383 | 319 |
| One True Hero (2022) | 97,116 | 215 |
| One Way Heroics (2012) | 1,570,484 | 2,351 |
