William Lehman Ashmead Bartlett Burdett-Coutts (20 January 1851 – 28 July 1921), born William Lehman Ashmead-Bartlett, was an American-born British Conservative politician who sat in the House of Commons from 1885 to 1921.
Ashmead-Bartlett was born in New Brunswick, New Jersey, United States, the son of Ellis Bartlett of Plymouth, Massachusetts, United States, and his wife Sophia Ashmead, daughter of John King Ashmead of Philadelphia. All his grandparents were British subjects and he was the younger brother of Ellis Ashmead-Bartlett. After his father's death in 1852 the family moved to England, and he was educated at Torquay and at Cholmeley's School, Highgate. He entered Keble College, Oxford in 1870 with a 1st Scholarship, graduating in 1875 with a B.A. (M.A. 1876). Ashmead-Bartlett was secretary to the philanthropist Baroness Burdett-Coutts.
He owned the Columbia Market (built in 1869 by Baroness Burdett-Coutts), and in connection with this, he built up a large fishing fleet in the North Sea, and a considerable trade in vegetables. However, a proposed railway to the market was never built, and competition from Billingsgate Fish Market led to the closing of the market in 1886.