South Olga township
- County:
- Cavalier County
- County Seat:
- No
- Area (mi²):
- 35.821
- State:
- North Dakota
South Olga township is located in Cavalier County, North Dakota. South Olga township has a 2026 population of 37. South Olga township is currently declining at a rate of -2.63% annually and its population has decreased by -5.13% since the most recent census, which recorded a population of 39 in 2020.