La Roche township
- County:
- Charles Mix County
- County Seat:
- No
- Area (mi²):
- 60.431
- State:
- South Dakota
La Roche township is located in Charles Mix County, South Dakota. La Roche township has a 2026 population of 367. La Roche township is currently growing at a rate of 1.1% annually and its population has increased by 1.94% since the most recent census, which recorded a population of 360 in 2020.