Thomas Evelyn Scott-Ellis, 8th Baron Howard de Walden, 4th Baron Seaford (9 May 1880 – 5 November 1946), was an English peer, landowner, writer and patron of the arts.
Lord Howard de Walden was also a powerboat racer who competed for Great Britain in the 1908 Summer Olympics.
Thomas Ellis was born in London on 9 May 1880. He was baptised with the name of Thomas Evelyn Ellis, and was known within his family as "Tommy". Educated at Eton College and the Royal Military College, Sandhurst, in 1917 he assumed the surname Scott-Ellis by Royal Licence.
Commissioned into the 10th Hussars, he saw military service as a Lieutenant in the Second Boer War before retiring from active service in August 1902. Scott-Ellis resumed military service during World War I, being promoted Major in the Royal Tank Corps.
After succeeding to his family titles in 1899 he inherited further estates in 1901, including property in Marylebone, London and earned the title of 'Britain's wealthiest bachelor'. He took a lease on [Audley End House], [Essex] which had once belonged to his ancestors, in 1904 but reportedly never felt settled there. In 1911, in preparation for his marriage, he leased Chirk Castle, Denbighshire, which became his main residence after WWI until 1946, and where he learned the Welsh language; he later served as president of the Campaign for the Protection of Rural Wales from 1931 to 1945.