Not in Love is a contemporary romance novel by #1 New York Times bestselling author Ali Hazelwood, published on June 11, 2024, by Berkley/Penguin Random House. The trade paperback edition runs 400 pages.

The story follows Rue Siebert, a biotech engineer at Kline, a promising food science startup, whose world is upended when Eli Killgore arrives leading a hostile takeover attempt. What begins as an adversarial relationship deepens into a forbidden, secret affair with a built-in expiration date—a charged exploration of what happens when professional rivalry and undeniable attraction collide.

An Indie Next Pick and LibraryReads Hall of Fame selection, the novel showcases Hazelwood's signature blend of STEM settings and slow-burn romance.