Summit Township is a township in Clay County, Iowa, USA. As of the 2000 census, its population was 452. Spencer Municipal Airport is located in the township.
Summit Township was created in 1872.
Summit Township covers an area of 35.3 square miles (91 km2) and contains one incorporated settlement, Fostoria. According to the USGS, it contains one cemetery, Evergreen.
At one point Great Lakes Airlines was headquartered in the township.