The English River is a tributary of the Iowa River in southeastern Iowa in the United States. The main stem of the river is 37.4 miles (60.2 km) long. Including its longest headwaters tributary, the North English River, the total length increases to 89.2 miles (143.6 km). Via the Iowa River, it is part of the Mississippi River watershed. The Deep River is a minor tributary of the English River. The towns of North English, South English and Deep River are named for the English and Deep rivers.

Washington County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 22,565. The county seat is Washington.