Robert Michael James Gascoyne-Cecil, 7th Marquess of Salisbury, Baron Gascoyne-Cecil, is a British Conservative politician. From 1979 to 1987 he represented South Dorset in the House of Commons, and in the 1990s he was Leader of the House of Lords under his courtesy title of Viscount Cranborne. Lord Salisbury lives in one of England's largest historic houses, the 17th-century Hatfield House in Hertfordshire, and currently serves as Chancellor of the University of Hertfordshire.

South Dorset is a constituency represented in the House of Commons of the UK Parliament since 2010 by Richard Drax, a Conservative. The constituency was created as a consequence of the Redistribution of Seats Act 1885, although the area covered has changed since then.