Amelia is an unincorporated community and former village in Clermont County, Ohio, United States. The population was 4,801 at the 2010 census. Amelia incorporated in 1900. In November 2019, residents voted to dissolve the village over the imposition of a local income tax.
Amelia was not officially platted. The area was originally called Milltown, later shortened to Milton. However, when a post office was established in 1836, there was already a Milton Post Office in the state. Various accounts state that the post office was named Amelia after Amelia Bowdoin, a well known and popular tollkeeper on the Ohio Turnpike (present-day State Route 125). Her home is now known as the Amelia Bowdoin House and stands at 94 West Main Street, across the street from its original location. However, there is no census record of an Amelia Bowdoin; Amelia may have been a corruption of the name of Armilla Bodin, the wife of a tollkeeper. Amelia was incorporated as a village on December 20, 1900.
Amelia's population rose from 4,801 in the 2010 census to an estimated 5,009 in 2018.