Mark Alexander Wynter-Blyth (15 August 1906 – 16 April 1963 Leysin, Switzerland) was an English schoolteacher and amateur naturalist who wrote one of the first field guides to the butterflies of the Indian region. He was also involved in censuses of the Asiatic Lion at the Gir forest.Wynter-Blyth was born at Harrow-on-the-Hill, Middlesex, studied at Sedbergh School, Yorkshire and Magdalene College, Cambridge.