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

Marion Township covers an area of 35.87 square miles (92.9 km2) and contains no incorporated settlements.

According to the USGS, it contains five cemeteries: Apostolic, Cook, Houg, Marion Lutheran and Mork.

The streams of Deer Creek and Sand Creek run through this township.

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