Katey Sagal (born Catherine Louise Sagal on January 19, 1956 in Hollywood, California), is a Jewish-American singer, writer, and actress most known for her portrayal of the character Peg Bundy in the American sitcom Married... with Children (1987 - 1997). Sagal hails from a Show business family. She is the daughter of director Boris Sagal, most known for his work on 60s TV dramas, including The Twilight Zone. Sagal is the older sister of twin actresses Jean Sagal (ne Barbara) and Liz Sagal, most remembered as the Doublemint Twins of the early 80s and for their own brief sitcom of that era: Double Trouble. She is also the sister of actor Joe Sagal. Sagal and her siblings grew up in the Madeville Canyon section of Brentwood, Los Angeles, California.

Sagal began her career working the Hollywood circuit. She appeared in several television movies between 1971 and 1975, including the Columbo picture Candidate for Crime and in 1973 working as a back-up singer for various mega-stars including Bob Dylan, Gene Simmons, and Tanya Tucker. She was plucked from relative obscurity by Bette Midler, who hired her for her 1979 tour as one of her back-up singers (The Harlettes).