Kathleen Glasgow is an American New York Times-bestselling author of young adult fiction. She is best known for her bestselling novel, Girl in Pieces.

Her other works include The Glass Girl, You'd Be Home Now, and How to Make Friends With the Dark. She is also known for The Agathas series, co-authored with Liz Lawson.

Glasgow is active on social media platforms like TikTok and Instagram, where she engages with her readers. You can visit her official website at Kathleen Glasgow Books.