Adel is a city along the North Raccoon River in Dallas County in the U.S. state of Iowa. The population was 3,435 at the 2000 census. It is the county seat of Dallas County and the birthplace of 1939 Heisman Trophy winner Nile Kinnick.
Adel is part of the Des Moines–West Des Moines Metropolitan Statistical Area.
Originally called Penoach, Adel was Incorporated in 1847, and changed its name sometime in 1849, although no specific information can be located within the city records. The town is situated on the west bank of the North Raccoon River, and at the time of its founding, along the only county road, making Adel the oldest town within Dallas County.