| Official Name: | Agency Township, South Dakota |
| Settlement Type: | Township |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Agency Township |
| Pushpin Map Caption: | Location within South Dakota##Location within the United States |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Roberts |
| Area Total Km2: | 93.2 |
| Area Land Km2: | 93.0 |
| Area Water Km2: | 0.2 |
| Area Total Sq Mi: | 36.0 |
| Area Land Sq Mi: | 35.9 |
| Area Water Sq Mi: | 0.1 |
| Population As Of: | 2000 |
| Population Total: | 277 |
| Population Density Km2: | 3.0 |
| Population Density Sq Mi: | 7.7 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 461 |
| Elevation Ft: | 1512 |
| Coordinates: | 45.5028°N -97.0258°W |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-00500[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1268566[2] |
Agency Township is a township in Roberts County, South Dakota, United States. The township is part of the Lake Traverse Reservation, which is home to the Sisseton Wahpeton Oyate Indian tribe. The tribe's headquarters at Agency Village are in the township, as is Sisseton Wahpeton College.[3]
As of the 2000 Census, there were 277 people, 83 households, and 70 families residing in the township. There were 98 housing units total. The racial makeup of the city was 71.8% Native American, 26.0% White, and 2.2% from two or more races.