Maple Valley Township is one of eighteen townships in Buena Vista County, Iowa, United States.

As of the 2000 census, its population was 259.

Maple Valley Township covers an area of 36.11 square miles (93.5 km2) and contains no incorporated settlements.

According to the USGS, it contains two cemeteries: Maple Valley and Saint John's Lutheran.

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