Greensburg
- County:
- Decatur County
- County Seat:
- Yes
- Area (mi²):
- 9.362
- State:
- Indiana
Greensburg is a city located in Decatur County, Indiana. Greensburg has a 2026 population of 12,317. It is also the county seat of Decatur County. Greensburg is currently declining at a rate of -0.28% annually and its population has decreased by -0.11% since the most recent census, which recorded a population of 12,330 in 2020.