Hugh William Osbert Molyneux, 7th Earl of Sefton (1898–1972) was the last of the Earls of Sefton.
He was educated at Harrow School and Sandhurst College. After pursuing a military career, he was appointed ADC to the Governor-General of Canada, ADC to the Viceroy of India, Lord-in-Waiting to the King and Lord Mayor of Liverpool.
He was a keen sportsman and was owner of racehorses, including Irish Lizard. He was a descendant of William Philip Molyneux, 2nd Earl of Sefton, who founded the Waterloo Cup and the Grand National.
His seats were Croxteth Hall, Lancs ; Abbeystead House, Wyresdale Forest; Grosvenor Cottage, Culross Street, W1.