Agnes Robertson Moorehead (December 6, 1900 – April 30, 1974) was an American actress. In a career spanning five decades, her credits included work in radio, stage, film, and television. Moorehead was the recipient of such accolades as a Primetime Emmy Award and two Golden Globe Awards, in addition to nominations for four Academy Awards.

Moorehead had joined Orson Welles' Mercury Players, as one of his principal performers in 1937. She also had notable roles in films such as Citizen Kane (1941), Dark Passage (1947), Show Boat (1951), and All That Heaven Allows (1955). Moorehead garnered four nominations for the Academy Award for Best Supporting Actress, for her performances in: The Magnificent Ambersons (1942), Mrs. Parkington (1944), Johnny Belinda (1948), and Hush...Hush, Sweet Charlotte (1964). She is also known for the radio play Sorry, Wrong Number (1943).

She gained acclaim for her role as Endora on the ABC sitcom Bewitched which she played from 1964 to 1972. Her performance earned her six nominations for the Primetime Emmy Award for Outstanding Supporting Actress in a Comedy Series. For her role on the western series The Wild Wild West, she won the Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series.