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.

The original manuscript published by Avon Books in 1959 was almost immediately pulled from the shelves due to objections over profanity in one particular passage.

The passage was rewritten and the book redistributed even though Kerouac reportedly objected to the changes [citation needed].

Duluoz is a high school athletics and football star who meets Maggie Cassidy and begins a devoted, inconstant, tender adolescent love affair.