Born 29 January 1865, the sixth son of James Dyall, a timber merchant, and his cousin, Charlotte Dyall. He was educated at University College School and at St Bartholomew's Hospital, where he was house surgeon and was awarded the Lawrence scholarship. He acted for a time as medical officer to the Royal Pimlico Dispensary, and was clinical assistant at the Royal Westminster Ophthalmic Hospital. He settled in general practice at 58 Creffield Road, West Acton, and died there on 29 August 1932. He married E M Cross, daughter of W H Cross, clerk to St Bartholomew's Hospital, on 29 May 1897; she survived him, but there were no children.