Nancy Springer (born July 5, 1948, in Montclair, New Jersey) is an American author with over fifty books spanning fantasy, young adult literature, mystery, and science fiction. A graduate of Gettysburg College, she drew on her lifelong passion for mythology, Arthurian legend, and Sherlock Holmes to craft imaginative worlds and characters.

Her novel Larque on the Wing won the James Tiptree Jr. Award in 1994, and she earned back-to-back Edgar Awards for Toughing It (1995) and Looking for Jamie Bridger (1996), as well as the Carolyn W. Field Award for I Am Mordred (1999). She is best known for The Enola Holmes Mysteries, beginning with The Case of the Missing Marquess in 2006, which became a Netflix film series starring Millie Bobby Brown and Henry Cavill.

With a career spanning nearly four decades, Nancy Springer's storytelling blends historical imagination, mythic richness, and emotional depth?whether reimagining legendary figures or giving life to new ones.