Kirsten Miller is an American novelist and the creator of the Kiki Strike book series. Her first book in the series, Kiki Strike: Inside the Shadow City, was released in 2006. The second book, The Empress's Tomb, was published in October 2007. The series follows the adventures of Kiki Strike, Ananka Fishbein, and their friends in New York City. The inspiration for the first book came when, in 2001, the lawn of a Manhattan nursing home collapsed, revealing an underground room.

Besides the Kiki Strike series, Kirsten Miller co-authored the children's series Nightmares! with Jason Segel, with the first book released in fall 2014. Her other series, The Eternal Ones, began with a book published on August 10, 2010.

Miller resides in New York City. Her most recent novel, Lula Dean's Little Library of Banned Books, is a satirical take on contemporary issues.

Her first adult novel, The Change, was a Good Morning America Book Club pick for May 2022. Kirsten Miller has authored over a dozen middle-grade and young adult novels, including the acclaimed Kiki Strike books, famous for narrating the tales of delinquent girl geniuses keeping Manhattan safe.