Sepsi OSK Sfântu Gheorghe
| Full name | Asociația Club Sportiv Sepsi OSK Sfântu Gheorghe | |||
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| Nickname(s) |
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| Short name | Sepsi | |||
| Founded | 2011 | |||
| Ground | Sepsi Arena | |||
| Capacity | 8,400 | |||
| Owner | László Diószegi | |||
| Chairman | Attila Hadnagy | |||
| Head coach | Ovidiu Burcă | |||
| League | Liga II | |||
| 2024–25 | Liga I, 15th of 16 (relegated) | |||
| Website | sepsiosk.ro | |||
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Asociația Club Sportiv Sepsi OSK Sfântu Gheorghe, commonly known as Sepsi OSK (Hungarian: [ˈʃɛpʃi ˈoɛʃkaː]), Sepsi Sfântu Gheorghe (Romanian: [ˈsepsi ˈsfɨntu ˈɡe̯orɡe]), or simply Sepsi, is a Romanian professional football club based in Sfântu Gheorghe, Covasna County, that competes in the Liga II.
Founded in 2011, it achieved promotion to the top tier in six years by quickly climbing through the Romanian league system. Sepsi thus became the first team from Covasna—a county with a majority of Székely ethnics—to play in the Liga I. Since its promotion, it qualified for three Cupa României finals, claiming the trophy in the 2021–22 and 2022–23 seasons. As cup holders, Sepsi also participated in the 2022 and the 2023 Supercupa României, winning both.
Sepsi's club colours are red and white in honour of the local football tradition. After playing during its first years at the Municipal Stadium in Sfântu Gheorghe, the squad was moved to the namesake Sepsi Arena Stadium in 2021.