Bear's Mill is a historic gristmill near the city of Greenville in Darke County, Ohio, United States.

Built in 1849,[1] this watermill is the oldest existing industrial building in Darke County.

After his locally made millstones proved faulty, Bear travelled to France, where he acquired stones of a type regarded worldwide as of highest quality.

[5] It remained in continuous operation for well over a century, slowing from full capacity only in the late 1970s when the miller decided to go into partial retirement.

[2] In 1975, it was listed on the National Register of Historic Places,[1] qualifying because of its architecture and because of its significance in Ohio's history.