Engine Summer is a novel by American writer John Crowley, published in 1979 by Doubleday. It was nominated for the 1980 National Book Award for hardcover science fiction, as well as both the British Fantasy and John W. Campbell Awards the same year. It was rewritten from Crowley's unpublished first novel, Learning to Live With It. It has been illustrated by Gary Friedman (1979) and Anne Yvonne Gilbert (1983).