Betty Lynn Buckley (born July 3, 1947) is an American actress and singer who has worked in film, television and theatre. She possesses a singing of voice of great power and beauty and has achieved great success in cabaret and concerts. Betty has also sustained a successful recording career with numerous cast albums and 18 solo albums to her credit, for which she has been nominated for two Grammys.

Buckley is widely known for the 1977–81 TV series Eight Is Enough. She joined the show in its second season when the original star, Diana Hyland, died after the first four episodes of season one, and her character Joan Bradford died as well. Buckley was cast as the central character's new romantic interest, Sandra Sue "Abby" Abbott, who became stepmother of the eight children to which the series' title refers. Betty later received two Daytime Emmy Award nominations for Outstanding Performer in a Children's Program/Special, for NBC Special Treat - Bobby and Sarah (1984) and ABC Afterschool Special - Taking a Stand (1989).