Fayette Township is a township in Decatur County, Iowa, United States.

Fayette Township covers an area of 23.16 square miles (59.99 square kilometers); of this, 0.21 square miles (0.53 square kilometers) or 0.88 percent is water.

The stream of Sevenmile Creek runs through this township.

The township contains two cemeteries: Hollen and Sweet Home.

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