Washington Township is a township in Story County, Iowa, United States.

Washington Township covers an area of 35.1 square miles (91 km2) and contains the incorporated town of Ames, as well as part of Kelley.

U.S. Route 69 runs north–south through the township and U.S. Route 30 runs east–west.

Washington Township is adjacent to Franklin, Grant and Palestine townships.

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