Garnavillo Township is a township in Clayton County, Iowa, United States.

Garnavillo Township covers an area of 33.13 square miles (85.8 km2) and contains one incorporated settlement, Garnavillo.

According to the USGS, it contains six cemeteries: Ceres, Garnavillo, Jenkins, McClelland, Saint Joseph and Saint Joseph.

The stream of West Branch South Cedar Creek runs through this township.

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