The Seigneur of Sark is the head of Sark in the Channel Islands. "Seigneur" is the French word for "lord", and a female head of Sark is called Dame of Sark, of which there have been three. The husband of a female ruler of Sark is not a consort but is jure uxoris a seigneur himself.

John Carteret, 2nd Earl Granville, 7th Seigneur of Sark,, commonly known by his earlier title Lord Carteret, was a British statesman and Lord President of the Council from 1751 to 1763 and worked closely with the Prime Minister of the country, Spencer Compton, Earl of Wilmington, to manage the various factions of the Government. He was Seigneur of Sark from 1715 to 1720, when he sold the fief. He held the office of Bailiff of Jersey from 1715 to 1763.