The Fabyan Windmill is an authentic, working Dutch windmill dating from the 1850s located in Geneva, Illinois. The 68 feet (21 m), five-story wooden smock mill sits upon the onetime estate of Colonel George Fabyan, but is now part of the Kane County Forest Preserve District.
In 1979, the windmill was listed on the National Register of Historic Places. The following year, the windmill was selected to be on a U.S. postage stamp as part of a series of five American windmills included in a stamp booklet called "WINDMILLS USA". It originally operated as a custom grinding mill.