Lancelot Edward Lowther, 6th Earl of Lonsdale, OBE, DL (25 June 1867 – 11 March 1953) was an English peer, the fourth and youngest son of Henry Lowther, 3rd Earl of Lonsdale.
Lowther was educated at Malvern College and Magdalene College, Cambridge. At Cambridge, he was a member of the University Pitt Club. On 13 October 1886 Lowther was made lieutenant in the 3rd Battalion, The Border Regiment (The Royal Cumberland Militia).
Soon thereafter, he was appointed a Deputy Lieutenant in the counties his family had traditionally dominated, Cumberland (21 November 1891) and Westmorland (26 January 1892). In keeping with the family tradition, he enjoyed sports and, by 1905, was a Master of the Drag (drag hunting) and the Deputy Master of the Quorn.
During World War I, he served in the Middle East, and after the war received the OBE (3 June 1919) and the Order of the Nile, 4th Class (16 January 1920). On 3 June 1922, the aging Lowther, now 55, resigned his deputy lieutenancy of Westmorland.
In 1944, he finally succeeded to the Earldom of Lonsdale on the death of his childless brother, Hugh. Hugh's free-spending, sporting life had largely wrecked the estate, and he was forced to auction off the contents of Lowther Castle in 1947. This proved to be the largest English country house sale of the 20th Century.
On 24 April 1889, Lonsdale married Gwendoline Sophia Alice Sheffield (born 1869, died 4 November 1921), daughter of Sir Robert Sheffield, 5th Baronet, with whom he had three children: