Kate McGregor-Stewart is an actress, best known for Failure to Launch, School of Rock, The Addams Family, and Father of the Bride. Other film credits include Now Departing, Sweet Dreams, Living Out Loud, Safe, Scrooged, A Midsummer Night's Sex Comedy, and The World According to Garp.

Television credits include Mary on ABC’s Scandal and Dean on CBS’ Young and the Restless.

Theater credits include her Broadway debut as Gwendolen Carr/Cecily Carruthers in Travesties (Ethel Barrymore Theatre); Mrs. Charlotte Wallace in Beyond Therapy (Brooks Atkinson Theatre); Marilyn in Grown Ups (Lyceum Theatre); and Allison Mortimer/Ma O’Reilly in A History of the American Film (ANTA Playhouse); Off-Broadway, as Nanny/Woman in the Park in Baby in the Bathwater, Wilma in The Perfect Party, and The Vienna Notes (Playwrights Horizons); and Titanic (Van Dam Theatre); and Regionally, in Miss Julie (Lincoln Center); The Frogs (Yale Repertory); and The Matchmaker (Hartford Stage).