Jefferson Township is one of sixteen townships in Buchanan County, Iowa, United States.

Jefferson Township covers an area of 36 square miles (93 km2) and contains one incorporated settlement, Brandon.

The unincorporated community of Shady Grove is at the northwestern edge of the township.

According to the USGS, it contains four cemeteries: Bear Creek School, First, Jefferson Township and Shady Grove (historical).

This article about the geography of Buchanan County, Iowa is a stub.