Joanna Moore (November 10, 1934 – November 22, 1997) was an American film and television actress. Over the course of her career, she appeared in more than eighty television and film roles.

From 1963 to 1967, she was married to actor Ryan O'Neal with whom she had two children: Griffin and Tatum O'Neal.

Moore's career hit its peak in the 1960s. During that time, she guest starred in several popular shows of the era including Alfred Hitchcock Presents, Perry Mason, Bewitched, and The Real McCoys. One of her more notable recurring roles was as Sheriff Andy Taylor's love interest, Peggy "Peg" McMillan in four episodes of The Andy Griffith Show from 1962 to 1963. Moore was a guest star in television westerns like The Rifleman, Wagon Train, Gunsmoke, The Rebel, and The Virginian. By the 1970s, her career began to wane because of drug and alcohol issues. She made her final onscreen appearance in 1986. Moore died of lung cancer in 1997.