Diane Keaton (née Hall; born January 5, 1946 in Los Angeles, California, U.S.) is an American actress. She has received various accolades throughout her career spanning over five decades, including an Academy Award, a British Academy Film Award, and two Golden Globe Awards, in addition to nominations for a Tony Award and two Emmy Awards. She was honored with the Film Society of Lincoln Center Gala Tribute in 2007 and an AFI Life Achievement Award in 2017.

Keaton's career began on stage when she appeared in the original 1968 Broadway production of the musical Hair. The next year she was nominated for a Tony Award for Best Featured Actress in a Play for her performance in Woody Allen's comic play Play it Again, Sam. She then made her screen debut in a small role in Lovers and Other Strangers (1970), before rising to prominence with her first major film role as Kay Adams-Corleone in Francis Ford Coppola's The Godfather (1972), a role she reprised in its sequels Part II (1974) and Part III (1990). She has frequently collaborated with Woody Allen, beginning with the film adaptation of Play It Again, Sam (1972). Her next two films with him, Sleeper (1973) and Love and Death (1975), established her as a comic actress, while her fourth, Annie Hall (1977), won her the Academy Award for Best Actress.

To avoid being typecast as her Annie Hall persona, Keaton appeared in several dramatic films, starring in Looking for Mr. Goodbar (1977) and Interiors (1978). She received three more Academy Award nominations for her roles as activist Louise Bryant in Reds (1981), a leukemia patient in Marvin's Room (1996), and a dramatist in Something's Gotta Give (2003). Keaton is also known for her starring roles in Manhattan (1979), Baby Boom (1987), Father of the Bride (1991), Father of the Bride Part II (1995), The First Wives Club (1996), The Family Stone (2005), Finding Dory (2016) and Book Club (2018).