The Adel Public Square Historic District, also known as The Square, is a nationally recognized historic district located in Adel, Iowa, United States.

It reached its largest size in 1917 with some redevelopment occurring on the east side of the square after World War II.

The historic district contains a mix of commercial buildings, professional offices, automotive and farm equipment related businesses, lodge halls, a single-family dwelling, and hatcheries.

Civic buildings include the Dallas County Courthouse (1902) and the former post office.

The network of brick streets is the historic structure in the district.