Washington Township is one of seventeen townships in Appanoose County, Iowa, United States. As of the 2010 census, its population was 722.
Washington Township was founded in 1848.
Washington Township covers an area of and contains one incorporated settlement, Moulton. According to the USGS, it contains six cemeteries: Garland, Hardin, Orleans, Otterbein South, Otterbien and Sunnyview.