Watermills
- in England
- Old Mill, Bexley, on the River Cray, Kent
- Old Mill, Borough Green, on the River Bourne, Kent
- Old Mill, Eynsford, on the River Darent, Kent
- Old Mill, Hollingbourne, also known as Old Mill, Leeds, on the River Len, Kent
- Old Mill, Loose, on the Loose Stream, Kent
- Old Mill, South Darenth, on the River Darent, Kent
- in the United States
- Old Mill (West Tisbury, Massachusetts)
- Old Mill (Vermilion, Ohio), listed on the NRHP in Erie County, Ohio
- Old Mill, Crystal, Colorado, listed on the NRHP in Gunnison County, Colorado
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