Denison Township is a township in Crawford County, Iowa, United States.

Denison Township covers an area of 35.39 square miles (91.7 km2) and contains one incorporated settlement, Denison (the county seat).

According to the USGS, it contains five cemeteries: Crawford County Home, Crawford Heights Memorial, Oakland, Saint Rose of Lima and Zion.

The streams of Coon Creek, East Boyer River and Willow Creek run through this township.

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