| One Million Worlds (2019) | 16 | 1 |
| One More Dungeon (2015) | 391,192 | 325 |
| One More Dungeon 2 (2022) | 314,313 | 239 |
| One More Gate : A Wakfu Legend (2022) | 468,350 | 415 |
| One More Island (2022) | 350,406 | 201 |
| One More Line (2014) | 399,177 | 97 |
| One More Shooter Game (2023) | 476 | 6 |
| One Must Fall: 2097 (1994) | 1,378,209 | 581 |
| One Must Fall: Battlegrounds (2003) | 82,543 | 22 |
| One Night at Flumpty's (2015) | 303,799,172 | 7,802 |
| One Night at Flumpty's 3 (2021) | 132,414,133 | 3,819 |
| One Night in Kawami (2024) | 0 | 0 |
| One Night Stand (2016) | 65,188,683 | 1,410 |
| 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) | 276,833 | 238 |
| One Night: Burlesque (2023) | 18,539 | 26 |
| One on One: Dr. J vs. Larry Bird (1983) | 142,395 | 69 |
| One Person Story (2018) | 7,669 | 23 |
| One Piece (2005) | 2,215,728 | 1,800 |
| One Piece - Nanatsu Shima no Daihihou (2002) | 24,905 | 29 |
| One Piece Bounty Rush (2018) | 337,151,051 | 82,556 |
| One Piece Grand Battle! 3 (2003) | 993,165 | 452 |
| One Piece Mansion (2001) | 1,105,392 | 98 |
| One Piece Odyssey (2023) | 99,220,880 | 55,221 |
| One Piece Treasure Battle! (2002) | 0 | 0 |
| One Piece Treasure Cruise (2014) | 192,162,104 | 33,185 |
| One Piece Unlimited Cruise 1 Wii (2008) | 3,281 | 22 |
| One Piece Unlimited Cruise: Episode 2 (2009) | 0 | 0 |
| One Piece: Become the Pirate King! (2000) | 23,067 | 35 |
| One Piece: Burning Blood (2016) | 200,740,424 | 25,131 |
| One Piece: Chopper no Daibouken (2003) | 18,740 | 17 |
| One Piece: Dai Kaizoku Colosseum (2016) | 887,403 | 107 |
| One Piece: Doragon Doriimu! (2005) | 34,976 | 19 |
| One Piece: Gear Spirit (2007) | 2,333,853 | 161 |
| One Piece: Gigant Battle! 2 - New World (2011) | 1,124,645 | 491 |
| One Piece: Going Baseball - Kaizoku Yakyuu (2004) | 3,750,483 | 57 |
| One Piece: Grand Adventure (2006) | 3,948,095 | 2,774 |
| One Piece: Grand Battle Swan Colosseum (2002) | 232,249 | 124 |
| One Piece: Grand Battle! (2005) | 5,613,356 | 2,883 |
| One Piece: Grand Cruise (2018) | 2,228,404 | 164 |
| One Piece: Great Pirate Colosseum (2016) | 407,907 | 140 |
| 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) | 99,035,670 | 21,413 |
| One Piece: Pirate Warriors 2 (2013) | 54,785,004 | 8,177 |
| One Piece: Pirate Warriors 3 (2015) | 163,229,152 | 36,261 |
| One Piece: Pirate Warriors 4 (2020) | 517,240,790 | 100,488 |
| One Piece: Pirates' Carnival (2005) | 546,683 | 372 |
| One Piece: Romance Dawn (2012) | 4,829,525 | 2,328 |
| One Piece: Round the Land (2004) | 645,012 | 571 |
| One Piece: Super Grand Battle! X (2014) | 2,769,728 | 229 |
| One Piece: Thousand Storm (2016) | 18,710,249 | 6,105 |
| 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) | 8,624,610 | 1,283 |
| One Piece: Unlimited Cruise (2008) | 7,424,501 | 1,879 |
| One Piece: Unlimited Cruise SP (2011) | 2,477,384 | 233 |
| One Piece: Unlimited World Red (2013) | 44,030,440 | 8,358 |
| One Piece: World Seeker (2019) | 92,669,270 | 20,701 |
| One Piece: Yume no Lufy Kaizokudan Tanjou (2001) | 22,438 | 77 |
| One Punch Man: A Hero Nobody Knows (2020) | 112,878,087 | 10,558 |
| One Room Dungeon (2025) | 27,636 | 34 |
| One S'More (2024) | 298 | 9 |
| One Shell Straight to Hell (2021) | 625,005 | 92 |
| One Socket (2024) | 71,219 | 18 |
| One Step After Fall (2022) | 72,533 | 195 |
| One Step From Eden (2020) | 6,082,308 | 5,365 |
| One Strike (2017) | 509,386 | 252 |
| One Tank Army (2023) | 39 | 1 |
| One Thousand Lies (2016) | 23,852 | 344 |
| One Troll Army (2016) | 2,941,424 | 323 |
| One True Hero (2022) | 97,148 | 215 |
