Parsonstown is the former name of the town of Birr, County Offaly in Ireland.
Parsonstown may also refer to: Two townlands in County Kildare: Parsonstown, Ardkill, in the civil parish of Ardkill, barony of Carbury Parsonstown, Donaghcumper, in the civil parish of Donaghcumper, barony of North Salt Parsonstown, County Louth, a civil parish and townland in County Louth in the barony of Ferrard Parsonstown, County Meath, a townland in County Meath in the civil parish of Rathregan, barony of Ratoath Parsonstown, County Westmeath, a townland in the civil parish of Tyfarnham, barony of Corkaree
See also Leviathan of Parsonstown, the unofficial name of the Rosse six-foot telescope.