William Heneage Legge, 6th Earl of Dartmouth, GCVO, KCB, VD, TD, PC, JP (6 May 1851 – 11 March 1936), styled Viscount Lewisham between 1853 and 1891, was a British peer and Conservative politician.

[10] The Conservatives fell from power in January 1886 but returned to office under Salisbury already in July of the same year, when Dartmouth was once again appointed Vice-Chamberlain of the Household,[11] a post he retained until 1891.

[13] Lord Dartmouth was honorary Colonel of the 5th volunteer battalion of the South Staffordshire Regiment from 1891, and of the 46th North Midland Divisional Train of the Royal Army Service Corps from 1908 to 1928, a period including the First World War,[14] for which he was appointed a KCB in 1917.

Lord Dartmouth married Lady Mary, fourth daughter of the Thomas Coke, 2nd Earl of Leicester, on 18 December 1879.

[1] Lord Dartmouth survived her by seven years and died at Patshull Hall, Staffordshire,[5] in March 1936, aged 84.