George Spencer-Churchill, Marquess of Blandford

George John Godolphin Spencer-Churchill, Marquess of Blandford (born 28 July 1992), styled as the Earl of Sunderland until 2014, is an English and polo player. He is a model and brand ambassador for La Martina, an Argentinean polo clothing and equipment company. He is the heir apparent to the Dukedom of Marlborough.

He is the son of Jamie Spencer-Churchill, 12th Duke of Marlborough and his first wife, Rebecca Mary Few Brown. Lord Blandford is a distant relative of the wartime prime minister Winston Churchill (first cousin of his great-great-grandfather) and of Diana, Princess of Wales (his 4th cousin once removed). He is also a descendant of Consuelo Vanderbilt.

He and his family are notable for being involved in a high-profile legal dispute around 1993, when his paternal grandfather, the 11th Duke of Marlborough, sought to disinherit his father. As his father has had a controversial past, including serving time in jail for forging prescriptions and road rage, Lord Blandford was announced as the financial beneficiary of his grandfather's estate. His inheritance includes Blenheim Palace, a 187-room mansion set on 2,000 acres in Oxfordshire.

Lord Blandford was educated at Harrow School, where he was captain of the school's polo team. He subsequently studied urbanisation at University College London.

In 2015, he began serving as a brand ambassador for the La Martina brand of polo clothes and accessories. Lord Blandford's Blenheim polo team plays at Cirencester Park Polo Club.

Lord Blandford is of direct male-lineage of Charles Spencer, 3rd Duke of Marlborough.