Mochrum is a coastal civil and Church of Scotland parish situated to the east of Luce Bay on the Machars peninsula and 8 miles (13 km) southwest of Wigtown and in the historical county of Wigtownshire in Galloway, Scotland. It covers 22,000 acres (8,900 ha) and is approximately 10 miles (16 km) in length and 5 miles (8.0 km) in breadth. The parish contains the eponymous village of Mochrum, as well as Port William and the clachan of Elrig.

The Machars is a peninsula in the historical county of Wigtownshire in Galloway in the south-west of Scotland. Its name is derived from the Gaelic word Machair meaning low-lying or level land, known as "links" on the east coast of Scotland. Although there are no high peaks in The Machars, it is not flat and would best be described as undulating or rolling. The North Atlantic Drift or Gulf Stream creates a mild climate, and dolphins and basking sharks are frequently seen in the seas.