Caithness and Sutherland was a county constituency of the House of Commons of the Parliament of the United Kingdom from 1918 to 1997. It elected one Member of Parliament (MP) by the first past the post system of election. The constituency was created by merging the constituencies of Caithness and Sutherland and the Dornoch and Wick components of the Wick Burghs constituency. In 1997 the constituency was superseded by the creation of Caithness, Sutherland and Easter Ross, which merged Caithness and Sutherland and the Easter Ross area of Ross, Cromarty and Skye.