The Decatur County Courthouse, located in Leon, Iowa, United States, was built in 1908.

It was listed on the National Register of Historic Places in 1981 as a part of the County Courthouses in Iowa Thematic Resource.

The first courthouse in Decatur County was a log structure built in Leon in for $375.

The Des Moines architectural firm of Smith, Wetherell and Gage designed the Renaissance Revival building.

Iron, stone, steel, tile, brick, marble, and granite were all used in its construction so as to protect it from fire, wind, and any other malady.