John Alfred Lush (21 March 1815 – 4 August 1888) was an English Liberal politician who sat in the House of Commons from 1868 to 1880. Lush was the son of John Lush of Berwick St John, Wiltshire and his wife Martha Kelleway daughter of James Kelleway of Donhead, Wiltshire. He was an MD of St Andrews University and became a general medical practitioner at Salisbury. He was a member of the Royal College of Physicians of London and one of the proprietors of the Fisherton House Lunatic Asylum. He was a J.P. and an Alderman of Salisbury, of which city he was Mayor for 1866–67.