Megan Mullally (born November 12, 1958) is an American actress, singer and media personality.

After working in theatre in Chicago, Mullally moved to Los Angeles in 1981, and appeared in small or supporting roles in film and television productions. She made her Broadway debut in 1994, and has appearance in several musical theatre productions.

From 1998 until 2006, she played Karen Walker on the TV sitcom Will & Grace. She won two Emmy Awards from seven consecutive nominations in the category of Outstanding Supporting Actress in a Comedy Series, three Screen Actors Guild Awards, and was nominated four times for a Golden Globe Award.