Greenfield Township is one of sixteen townships in Calhoun County, Iowa, United States.

Greenfield Township was created in 1870.

It was probably named from the green prairie grass.

[3] Greenfield Township covers an area of 36.98 square miles (95.8 km2) and contains one incorporated settlement, Knierim.

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