Maggie Cassidy is a novel by the American writer Jack Kerouac, first published in 1959. It is a largely autobiographical work about Kerouac's early life in Lowell, Massachusetts, from 1938 to 1939, and chronicles his real-life relationship with his teenage sweetheart Mary Carney. It is unique for Kerouac for its high school setting and teenage characters. He wrote the novel in 1953 but it was not published until 1959, after the success of On the Road (1957).