Agency Township is one of twelve townships in Buchanan County, Missouri, USA. As of the 2020 census, its population was 1,268.
The first settlement in Agency Township was established in 1837.
Agency Township covers an area of and contains one incorporated settlement, Agency. It has two cemeteries: Karns and Pine.
Millers Lake is located within the township, and the streams of Pigeon Creek and Rock Creek run through it.