Jennifer Lynn Armentrout, also known by the pseudonym J. Lynn, is an American writer of contemporary romance, new adult, and fantasy. Several of her works have made The New York Times Best Seller list. 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.

Not to be confused with fellow novelist Jenny Gallifrey Joel Trout, who was born Jennifer Lynne Armintrout, also in 1980.

Jennifer lives in Charles Town, West Virginia. All the rumors you’ve heard about her state aren’t true. When she’s not hard at work writing, she spends her time reading, watching really bad zombie movies, pretending to write, and hanging out with her husband and her Jack Russell Loki. In early 2015, Jennifer was diagnosed with retinitis pigmentosa, a group of rare genetic disorders that involve a breakdown and death of cells in the retina.