Lidtke Mill, also known as the Lime Springs Mill Complex, is a historic building located on the Upper Iowa River located in the "Old Town" area of Lime Springs, Iowa, United States.

The mill is an L-shaped structure is composed of limestone covered with a yellow brick veneer.

At one time, it not only milled grains but also provided hydroelectric power to surrounding communities.

The mill and the miller's house were listed together on the National Register of Historic Places in 1977.

This article about a property in Howard County, Iowa on the National Register of Historic Places is a stub.