Celina
- County:
- Mercer County
- County Seat:
- Yes
- Area (mi²):
- 5.028
- State:
- Ohio
Celina is a city located in Mercer County, Ohio. Celina has a 2026 population of 10,945. It is also the county seat of Mercer County. Celina is currently growing at a rate of 0.55% annually and its population has increased by 0.15% since the most recent census, which recorded a population of 10,929 in 2020.