Nancy Sullivan (born October 17, 1969) is an American actress, TV host and screenwriter. She is a comedy actress and received improv training as a member of The Groundlings in San Jose.

She was a regular cast member on The Amanda Show, where throughout the show's run, she played such characters as Marcy Stimple, Mrs. Klutz, Ms. DeBoat, and other various teachers, and customers for "Blockblister" and "...Dooper" skits. She usually ended up playing the mother in family-centered sketches. She was the only remaining adult credited as a star after the departure of John Kassir.

She later joined castmates Drake Bell and Josh Peck on Drake & Josh, playing their mother and stepmother respectively, Audrey Parker-Nichols. She reprised the role for the television films Drake & Josh Go Hollywood, Really Big Shrimp, and Merry Christmas, Drake & Josh.

She also played Mr. Bender's wife in an episode of Zoey 101.