The Bourne Ultimatum is the third Jason Bourne (Jason Bourne (character)) novel written by Robert Ludlum and a sequel to The Bourne Supremacy (The Bourne Supremacy (novel)) (1986). First published in 1990, it was the last Bourne novel to be written by Ludlum himself. Eric Van Lustbader wrote a sequel titled The Bourne Legacy fourteen years later.

A film titled The Bourne Ultimatum starring Matt Damon was released in 2007. As in the 2004 film, The Bourne Supremacy (The Bourne Supremacy (film)), The Bourne Ultimatum (The Bourne Ultimatum (film)) has a completely different plot from the novel.