Caithness and Sutherland was a county constituency of the House of Commons of the Parliament of the United Kingdom from 1918 to 1997.

The reform was the first since the Redistribution of Seats Act of 1885, and its main aim was to make constituencies more equal in terms of the sizes of their electorates.

In 1975 counties and burghs were abolished and the constituency became an area within the Highland region.

The region included two new local government districts, called Caithness and Sutherland.

The Sutherland district had a small area, the Kincardine electoral division, within the Ross and Cromarty constituency.