Elk Township is one of eighteen townships in Buena Vista County, Iowa, USA.

As of the 2000 census, its population was 223.

Elk Township covers an area of 36.26 square miles (93.9 km2) and contains no incorporated settlements.

According to the USGS, it contains two cemeteries: Elk and Plainview.

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