| Club: | FC Onești |
| Season: | 1999–2000 |
| Stadium: | Stadionul FC Onești |
| League: | Divizia A |
| League Result: | 16th (relegated) |
| Cup1: | Cupa României |
| Cup1 Result: | First round proper |
The 1999–2000 FC Onești season was the club's sixth season in existence and the club's second consecutive season in the top flight of Romanian football. In addition to the domestic league, FC Onești participated in this season's edition of the Cupa României.
See main article: 1999–2000 Divizia A.
See main article: 1999–2000 Cupa României.