William Legge, 2nd Earl of Dartmouth, PC, FRS (20 June 1731 – 15 July 1801), styled as Viscount Lewisham from 1732 to 1750, was a British statesman who served as Secretary of State for the Colonies from 1772 to 1775, during the initial stages of the American Revolution.

Gerald Humphry Legge, 9th Earl of Dartmouth FCA (26 April 1924 – 14 December 1997), styled Viscount Lewisham between 1958 and 1962, was a British peer and businessman.

William Legge, 10th Earl of Dartmouth (born 23 September 1949), styled Viscount Lewisham from 1962 to 1997, is a British politician and hereditary peer, usually known as William Dartmouth.