Rushen (/ˈrʊʃən/ RUUSH-ən; Manx: Rosien), formally Kirk Christ Rushen, is one of the seventeen historic parishes of the Isle of Man.

It is located in the south of the island (part of the traditional South Side division) in the sheading of the same name.

Administratively, part of the historic parish of Rushen, and the majority of the population, is now covered by the village districts of Port Erin and Port St Mary. As a result, there is an exclave of the parish district which includes the Calf of Man.

Other settlements in the parish include Cregneash.

For the purposes of local government, the majority of the area of the historic parish formed a single parish district, with Commissioners, but this has now been amalgamated with Arbory.(See Arbory and Rushen.)

Since the 1880s, two areas of the historic parish of Rushen have been the separate village districts of Port Erin and Port St Mary, each with its own village commissioners.

The Captain of the Parish (since 2023) is Paul Costain.

Rushen parish is split between two House of Keys constituencies: Rushen, covering the majority of the parish including Port Erin and Port St Mary, and the Arbory, Castletown & Malew constituency, which covers the eastern part of the historic parish. Each constituency elects two Members to the House of Keys. Before 2016, the whole parish was in the Rushen constituency.