Otterville
- County:
- Greene County
- County Seat:
- No
- Area (mi²):
- 1.006
- State:
- Illinois
Otterville is a town located in Greene County, Illinois. Otterville has a 2026 population of 83. Otterville is currently declining at a rate of -1.19% annually and its population has decreased by -3.49% since the most recent census, which recorded a population of 86 in 2020.