Ignatius Frederick "Ian" Clarke (10 July 1918, Wallasey, Cheshire, U.K. – 5 November 2009, Milton-under-Wychwood, Oxfordshire, U.K.) was a British scholar and professor of English, known for his work on science fiction as a bibliographer, historian and editor, and also, with his wife Margaret, as a translator of early French science fiction.
In October 1958 he became Senior Lecture in General Studies in the Department of Industrial Administration at the Royal College of Science and Technology (which became part of the University of Strathclyde).
Clarke specialized in future-war fiction and his 1966 work Voices Prophesying War is recognized as a major contribution.
From 1970 to 1973 he was the chief editor for the science fiction reprint program of Cornmarket Press.
In 1998 he received the SFRA Pioneer Award for his essay Future-War Fiction: The First Main Phase, 1871–1900.