Marian Hall Seldes (August 23, 1928 – October 6, 2014) was an American stage, film, radio, and television actress whose career spanned over 60 years. A five-time Tony Award nominee, she won the Tony Award for Best Featured Actress in a Play for A Delicate Balance in 1967, and received subsequent nominations for Father's Day (1971), Deathtrap (1978–82), Ring Round the Moon (1999), and Dinner at Eight (2002). She also won a Drama Desk Award for Father's Day. Her other Broadway credits included Equus (1974–77), Ivanov (1997), and Deuce (2007). She was inducted into the American Theater Hall of Fame in 1995 and received the Special Tony Award for Lifetime Achievement in 2010.
Seldes died on October 6, 2014 in her Central Park South apartment, aged 86 years. She was survived by her daughter, brother, sister-in-law, and extended family.
The cause of her death was not released. However, in 2017, it was reported that a documentary about her life, Marian, by director R.E. "Rick" Rodgers", chronicling Seldes' last years, had created "consternation in the theater world" as a "horrific, intrusive depicting of her slide into dementia".