Hammel and Millgrove are extinct towns in western Warren County, Ohio, United States. They are located along the Little Miami River, about 2 miles (3 km) south of Fort Ancient and 1 mile (1½ km) north of Roachester at the Strout Road crossing of the river. Hammel lies on the eastern shore of the river, in southwestern Washington Township, and Millgrove lies on the western shore of the river, in northeastern Salem Township.

Hammel had its start in the 1840s when the railroad was extended to that point.^[1] The community was named after its founder.^[1] The GNIS considers Hammel to be a ghost town.^[2]

v t e Municipalities and communities of Warren County, Ohio, United States
County seat: Lebanon
Cities	Carlisle‡ Franklin Lebanon South Lebanon Loveland‡ Mason Middletown‡ Monroe‡ Springboro‡
Villages	Blanchester‡ Butlerville Corwin Harveysburg Maineville Morrow Pleasant Plain Waynesville
Townships	Clearcreek Deerfield Franklin Hamilton Harlan Massie Salem Turtlecreek Union Washington Wayne
CDPs	Five Points Hunter Kings Mills Landen Loveland Park‡ Roachester
Unincorporated communities	Blackhawk Chautauqua‡ Cozaddale Crosswick Dallasburg Dodds Edwardsville Fosters Genntown Greentree Corners Gum Grove Hagemans Crossing Hickoryville Hicks Hillcrest Hopkinsville Kenricksville Level Mathers Mill Merrittstown Middleboro Mount Holly Murdoch Oregonia Osceola Pekin Red Lion Ridgeville Rossburg San Mar Gale Socialville Twenty Mile Stand Wellman Zoar
Ghost towns	Beedles Station Browns Store Butterworth Hammel and Millgrove Venable
Footnotes	‡This populated place also has portions in an adjacent county or counties
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39°23′09″N 84°05′22″W / 39.38583°N 84.08944°W / 39.38583; -84.08944