La Roche
- County:
- Charles Mix County
- County Seat:
- No
- Area (mi²):
- 60.431
- State:
- South Dakota
La Roche is located in Charles Mix County, South Dakota. La Roche has a 2025 population of 359. La Roche is currently declining at a rate of -0.28% annually and its population has decreased by -0.55% since the most recent census, which recorded a population of 361 in 2020.