| St. Mary's Episcopal Church | |
| Location: | North Crescent St., Flandreau, South Dakota |
| Coordinates: | 44.0581°N -96.5939°W |
| Built: | 1879 |
| Architecture: | Gothic Revival |
| Added: | September 13, 2001 |
| Area: | less than one acre |
| Refnum: | 01000998 |
St. Mary's Episcopal Church, also known as the Flandreau Indian School Chapel, is a historic church on North Crescent Street in Flandreau, South Dakota.
It was built in 1879 and was added to the National Register in 2001.
It is one of numerous historic sites in Flandreau, one of South Dakota's oldest cities.[1]