O
| Title | Release | Developers | Publishers | Regions |
|---|---|---|---|---|
| O'Leary Manager 2000 | September 15, 2000 | LiveMedia | Ubisoft | |
| Oddworld Adventures II | January 19, 2000 | Saffire | GT Interactive | |
| Ohasta Yamachan & Reimondo | 1999 | JP | ||
| Ojaru Maru: Mitsunegai Jinja no Ennichi de Ojaru! | June 30, 2000 | MTO | MTO | JP |
| Ojaru Maru: Tsukiyo ga Ike no Takaramono | July 14, 2000 | Success | Success | JP |
| Oodorobou Jing Angel | 1999 | JP | ||
| Oodorobou Jing Devil | 1999 | JP | ||
| Operation Carrots: Starring Bugs and Lola Bunny | 1999 | Infogrames | Infogrames | EU |
| Othello Millennium | October 8, 1999 | Tsukuda Original | Tsukuda Original | JP |
| Other Life: Azure Dreams | August 5, 1999 (JP) | Konami | Konami | EU, NA, JP |
| Ottifanten: Kommando Störtebecker | 2001 | Kritzelkratz | JoWooD | EU |
Read more about this topic: List Of Game Boy Color Games