Cynthia is a hamlet in central Alberta, Canada within Brazeau County. It is located approximately south of Highway 16 and southwest of Edmonton.
Cynthia previously held new town status for almost three years, having incorporated as a new town on June 1, 1956, but dissolving on May 1, 1959.
The population of Cynthia according to the 2005 municipal census conducted by Brazeau County is 50.