Donna Mills (born Donna Jean Miller; December 11, 1940) is an American actress. She began her television career in 1966 with a recurring role on The Secret Storm, and in the same year appeared on Broadway in the Woody Allen comedy Don't Drink the Water. She made her film debut the following year in The Incident. She then starred for three years in the soap opera Love is a Many Splendored Thing (1967–70), before starring as Tobie Williams, the girlfriend of Clint Eastwood's character in the 1971 cult film Play Misty for Me.
Mills landed the role of Abby Cunningham on the primetime soap opera Knots Landing in 1980 and was a regular on the show until 1989. For this role, she won the Soap Opera Digest Award for Outstanding Villainess three times, in 1986, 1988, and 1989. She has since starred in several TV movies, including False Arrest (1991), In My Daughter's Name (1992), Dangerous Intentions (1995), The Stepford Husbands (1996), and Ladies of the House (2008). In 2014, she joined the cast of long-running daytime soap opera General Hospital, for which she won a 2015 Daytime Emmy Award for Outstanding Special Guest Performer in a Drama Series.