Acthorpe is a hamlet in the East Lindsey district of Lincolnshire, England. It is approximately north-west from the town of Louth, and in the Lincolnshire Wolds, a designated Area of Outstanding Natural Beauty. Acthorpe is part of the civil parish of Elkington.
Acthorpe does not appear in the Domesday Book and is considered a deserted medieval village.
Acthorpe Farm House is a Grade II listed building of red brick, dating from 1740, with nineteenth- and twentieth-century alterations.
Acthorpe Wood is an area of semi-natural ancient woodland.