Dedee Pfeiffer, born Dorothy Diane Pfeiffer on January 1, 1964, in Midway City, California, is an American actress known for her roles in both film and television. She is the younger sister of the famous actress Michelle Pfeiffer. She began her acting career in 1985 with a role in the TV series "Simon & Simon" and made her film debut in "Into the Night," starring alongside her sister Michelle.

Over the years, she has appeared in numerous films, including "Vamp" (1986), "The Allnighter" (1987), and "The Horror Show" (1989).

In television, Dedee Pfeiffer is perhaps best known for her role as Rachel Robbins Blanders on the CBS sitcom "Cybill" (1995-1998) and as Sheri DeCarlo-Winston on the NBC/The WB sitcom "For Your Love" (1998-2002). She took a break from acting in 2010 to battle alcohol addiction and earned a master's degree in social work during that time.

In 2020, she returned to acting and began starring as Denise Brisbane in the ABC crime drama series "Big Sky".

Her lifestyle has seen various ups and downs, including her candid appearance in the February 2002 issue of Playboy magazine. She has also been involved in environmental conservation efforts and has worked as a cocktail waitress and Disneyland parade dancer in her early years. She has been married and divorced multiple times, with her most recent marriage ending in 2013.

Throughout her career, she has received several awards and nominations, including recognition for her work on short films "The Tub" and "Laredo," as well as the award-winning film "L.A., I Hate You".