Julia Glass (born March 23, 1956) is an American novelist. Her debut novel, Three Junes, won the National Book Award for Fiction in 2002. Glass followed Three Junes with a second novel, The Whole World Over, in 2006, set in the same Bank Street–Greenwich Village universe, with three interwoven stories featuring several characters from Three Junes. Her subsequent novels include I See You Everywhere (2008), The Widower's Tale (2010), And the Dark Sacred Night (2014), The House Among the Trees (2017), and Vigil Harbor (2022).

Glass was born in Boston and grew up in Belmont, Massachusetts, and Lincoln, Massachusetts. She attended Concord Academy and graduated from Yale in 1978. Initially intending to become a painter, she moved to New York City, where she painted in a small studio in Brooklyn and supported herself as a freelance editor and copy editor, including several years at Cosmopolitan magazine.

She currently resides in Marblehead, Massachusetts, with her partner, photographer Dennis Cowley, and their two children. Besides being a freelance journalist and editor, she teaches fiction writing at Emerson College. She has been recognized with numerous awards, including the William Faulkner - William Wisdom Creative Writing Competition and a 2015 James Merrill House Fellowship.