Union Mill or Union Mills may refer to:
British Isles
Communities
Union Mills, a village on the Isle of Man
Windmills
Union Mill, Appledore, a windmill in Kent
Union Mills, Burnham Overy, a combined wind and watermill in Norfolk
Union Mill, Beverley, a windmill in the East Riding of Yorkshire
Union Mill, Cranbrook, a windmill in Kent
Union Mill, Gainsborough, a windmill in Lincolnshire
Union Mill, Gilberdyke, a windmill in the East Riding of Yorkshire
Union Mill, Hackney, a windmill in Middlesex
Union Mill, Lynstead, a windmill in Kent
Union Mill, Onehouse, a windmill in Suffolk
Union Mill, Whitby, a windmill in the North Riding of Yorkshire
Union Mills, Thurning a windmill in Norfolk
Boreas Union Mill, Pontefract, a windmill in the West Riding of Yorkshire
Watermills
Union Mills, Burnham Overy, a combined wind and watermill in Norfolk
Textile mills
Union Mills, Milnsbridge, Yorkshire
United States
(by state) Communities Union Mills, Indiana, an unincorporated community Union Mills, Iowa, an unincorporated community Union Mills, Maryland, an unincorporated community Union Mills, Virginia, an unincorporated community Union Mill, Washington, an unincorporated community Union Mills, Pleasants County, West Virginia, an unincorporated community
Watermills
Union Mills (Fall River, Massachusetts), listed on the National Register of Historic Places (NRHP) Union Mill Complex, Ballston Spa, NRHP-listed