John Osmael Scott-Ellis, 9th Baron Howard de Walden, 5th Baron Seaford (27 November 1912 – 10 July 1999) was a British peer, landowner, and a Thoroughbred racehorse owner/breeder. He was the son of Margarita van Raalte and her husband, Thomas Scott-Ellis, 8th Baron Howard de Walden, whose London home was Seaford House in Belgravia; and he was educated at Eton College.