Shelbyville
- County:
- Shelby County
- County Seat:
- Yes
- Area (mi²):
- 0.776
- State:
- Missouri
Shelbyville is a city located in Shelby County, Missouri. Shelbyville has a 2026 population of 503. It is also the county seat of Shelby County. Shelbyville is currently declining at a rate of -0.2% annually and its population has decreased by -3.08% since the most recent census, which recorded a population of 519 in 2020.