Washington Township is one of twelve townships in Chickasaw County, Iowa, USA. As of the 2000 census, its population was 954.
Washington Township covers an area of 53.69 square miles (139.1 km2) and contains two incorporated settlements: Alta Vista and North Washington. According to the USGS, it contains four cemeteries: Calvary, Eggleston Farm, Saint Marys and Union.
Washington Township contains one airport or landing strip, New Hampton Municipal Airport.