Holly Black is the bestselling author of contemporary fantasy novels for teens and children.

Her first book, Tithe: A Modern Faerie Tale, was published in 2002 by Simon & Schuster. Tithe was called "dark, edgy, beautifully written and compulsively readable" by Booklist, received starred reviews from Publisher's Weekly and Kirkus Reviews, and was included in the American Library Association's Best Books for Young Adults. Holly has since written two other books in the same universe, Valiant (2005), and the sequel to Tithe, Ironside (2007), which spent five weeks on the New York Times bestseller list. Valiant was a finalist for the Mythopoeic Award for Young Readers and the recipient of the Andre Norton Award for Excellence in Young Adult Literature.

Holly collaborated with her long-time friend, Caldecott award winning artist, Tony DiTerlizzi, to create the bestselling Spiderwick Chronicles. The first two books, The Field Guide and The Seeing Stone were released together in 2003 by Simon & Schuster, with the next three, Lucinda's Secret (2003), The Ironwood Tree (2004) and The Wrath of Mulgarath (2004), following in rapid succession. The Wrath of Mulgarath climbed to #1 on the New York Times bestseller list. The five-book serial has been called "vintage Victorian fantasy" by the New York Post and Time Magazine reported that "the books wallow in their dusty Olde Worlde charm."

The lavishly illustrated Arthur Spiderwick's Field Guide to The Fantastical World Around You (2005), The Notebook for Fantastical Observations (2005), and Care and Feeding of Sprites (2006) expanded the Spiderwick universe. To date, the books have been translated into 32 languages. There are three more chapter books in the Beyond the Spiderwick Chronicles series,The Nixie's Song(2007), A Giant Problem (2008) and The Wyrm King(2009).

The Spiderwick Chronicles were adapted into a film by Paramount Pictures in conjunction with Nickelodeon Films. Released in February 2008, the film stars Freddie Highmore and Sarah Bolger, with Mark Waters as the director.

Holly has also been a frequent contributor to anthologies, and has co-edited three of them: Geektastic (with Cecil Castellucci, 2009), Zombies vs. Unicorns (with Justine Larbalestier, 2010), and Bordertown (with Ellen Kushner, 2011). Her first collection of short fiction, Poison Eaters and Other Stories, came out in 2010 from Small Beer Press. She has just finished the third book in her Eisner-nominated graphic novel series, The Good Neighbors, and is working on Red Glove, the second novel in The Curse Workers series. White Cat, the first in the series, is out as of May 2010, and is about capers, curse magic, and memory.

Holly lives in Massachusetts with her husband, Theo, in a house with a secret library.