The Aitkin County Courthouse and Jail, in Aitkin, Minnesota, United States, serves as the county seat of Aitkin County.

The first courthouse was built in 1888, but in 1920, a grand jury reported that the building was dangerous and "falling apart".

After difficulties securing financing, the county commissioners approved a plan for a new courthouse, which was finished in 1929.

The design mixes Beaux-Arts architecture and Moderne elements.

The interior features marble wainscoting, oak woodwork, terrazzo floors, and stained glass skylights.