Onchan ( ONK-ən; Manx: Connaghyn), historically Kirk Conchan, is one of the seventeen historic parishes of the Isle of Man.It is located on the east of the island (part of the traditional South Side division) in the sheading of Middle, though before 1796 it was in the sheading of Garff.Administratively, part of the historic parish of Onchan is now covered by part of the borough of Douglas, the capital and largest town of the Isle of Man.