Isabel Keating (born May 1, 1961) is an American actress and singer. She is known for her performance as Judy Garland in the original Broadway production of The Boy from Oz, which earned her a Tony Award nomination and a Drama Desk Award.

Keating was born in Savannah, Georgia on May 1, 1961, to a Southern father and Moroccan mother. This background gave rise to an early knack for mimicking accents and, eventually, fluency in multiple languages. As she would tell AP's Lisa Tolin many years later, it was not until reaching her early twenties that Keating, who had long since assumed she would put those skills to use professionally as an interpreter, first "fell into" theater. Her first landing spot—or at least the first paying one—was with the Little Theatre of Savannah Mini-Rep Company, with whom Keating was performing children's theatre as early as the winter of 1983.

Keating made her Broadway debut in 2003, in Enchanted April. She replaced Molly Ringwald in the role of Rose Arnott after having created the leading role of Lotty Wilton in the play's world-premiere production at Hartford Stage Company in Hartford, Connecticut.

Keating was widely acclaimed for her portrayal of Judy Garland in the 2003 Broadway production of The Boy From Oz, in which she starred opposite Hugh Jackman (who played Peter Allen). For her performance she received a Tony Award nomination and won a Drama Desk Award and Theatre World Award.

She joined the Broadway cast of Hairspray, directed by Jack O'Brien, in the role of Velma Von Tussle in June 2006 and stayed with the production through August 2007.

Keating played Peter Parker's Aunt May and other characters in the Broadway production of Spider-Man: Turn Off the Dark, directed by Julie Taymor.

From 2014 to 2015, Keating appeared on Broadway in Terrence McNally's hit comedy It's Only a Play, directed by Jack O'Brien.

She played Madame Morrible in Wicked on Broadway from January through November 2018 after performing the same role in the U.S. National Tour.