Lonan is one of the 17 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 Garff.
Other settlements in the parish include Baldrine and Ballabeg.
The parish extends from near Port Groudle in the south to the Snaefell mines and Brandywell Corner (on the TT course to the east of Beinn-y-Phott), a distance of some 6 miles (10 km), and has an area of 15 square miles (39 km2). It is an upland district, being hilly and barren in parts, and dropping sharply into the sea, with the exception of a few small deep, sheltered glens.