Michael Sadleir (25 December 1888 – 13 December 1957) was a British publisher, novelist, book collector and bibliographer. Born Michael T. H. Sadler in Oxford, the son of Sir Michael Ernest Sadler, he later adopted the older variant of his surname to differentiate himself from his father, a historian, educationist, and Vice-Chancellor of the University of Leeds. Before the First World War, Sadleir and his father were keen collectors of contemporary art, and purchased works by young English artists such as Stanley Spencer and Mark Gertler. They were amongst the first collectors (and certainly the first English collectors) of the paintings of the Russian-born German Expressionist artist Wassily Kandinsky.
