| Official Name: | Ostby Township |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | North Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Bottineau |
| Unit Pref: | Imperial |
| Population As Of: | 2010 |
| Population Total: | 45 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 48.5894°N -100.3394°W |
Ostby Township is a civil township in Bottineau County in the U.S. state of North Dakota. As of the 2010 census, its population was 45.[1]