Sir William Job Collins KCVO (9 May 1859 – 11 December 1946) was a surgeon and later a Liberal politician and legislator.
He was born at 46 Gloucester Road, Regent's Park, London the eldest son of William Job Collins (also a doctor) and Mary Anne Francisca (née Treacher). He attended University College School, London, and began his medical training at St Bartholomew's Hospital, where he became ophthalmic house surgeon, extern midwifery assistant and assistant demonstrator of anatomy at the medical school. His Times obituary reported that ' his further progress toward the staff of the school was barred by the heterodox views he held, and freely expressed, on the subject of vaccination' .
He subsequently became a Fellow, Scholar and gold medallist in Sanitary Science and Obstetrics at the University of London, graduating as BSc in 1880 and MD in 1881.
Along with Charles Creighton and Edgar Crookshank, he became one of a small number of medical critics of smallpox vaccination in the late 19th century. He was also a member of the Royal Commission on Vaccination, 1889-1896.
He later specialised in anatomy and ophthalmology, in 1918 receiving the University of Oxford Doyne Ophthalmic Medal, having been knighted in 1902. He served two terms as Vice-Chancellor of the University of London in 1907-1909 and 1911-12.