Jennifer Lynn Armentrout is an American writer of contemporary romance, paranormal, and science fiction.

Some of her works have been on the New York Times bestseller list. Her young adult novel Obsidian has been optioned by Sierra Pictures.

She is considered a "hybrid" author, having successfully self-published while maintaining active contracts with small independent presses, and traditional publishers. Her current publishers include Spencer Hill Press, Entangled Publishing, Harlequin Teen, Disney/Hyperion, and HarperCollins. Armentrout is highly prolific and states that she writes for eight hours a day almost every day.