Mordecai Cubitt Cooke (12 July 1825, in Horning, Norfolk – 12 November 1914, in Southsea, Hampshire) was an English botanist and mycologist who was, at various points, a London schoolteacher, a Kew mycologist, curator at the India Museum, journalist and author, . Cooke was the elder brother of the art-education reformer Ebenezer Cooke (1837–1913) and father of the book illustrator and watercolour painter William Cubitt Cooke (1866–1951).