This is a list of winners and nominees of the Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series. Prior to 1989, the category was not gender-specific, and, thus, was called Outstanding Guest Performer in a Comedy Series. It is given in honor to an actress who has delivered an outstanding performance in a guest-starring role in a television comedy series. The current recipient is Julianne Nicholson for Hacks. Since the category change in 1989, a total of 34 actresses were awarded for their performances. The most awarded actress is Cloris Leachman, with 3 wins, followed by Tina Fey, Colleen Dewhurst, Kathryn Joosten, Jean Smart, Tracey Ullman, Betty White, and Maya Rudolph, with 2 wins. These awards, like the other "Guest" awards, were previously not presented at the Primetime Emmy Award ceremony, but, rather, at the Creative Arts Emmy Award ceremony.
Beginning with the 77th Primetime Emmy Awards, performers are no longer eligible in guest acting categories if they were previously nominated for a lead or supporting award for playing the same character role in the same series.