Nancy McKenzie (b. 1942) is a Mexican voice actress who dubbed Nanny on Los Pequeños Muppets (Muppet Babies), Andie MacDowell in the Spanish dub of Muppets Tonight, and Shelley Snipes in Los Muppets en el Espacio (Muppets from Space). For Creature Shop-effects projects, she dubbed Fly in Babe, Irene Papas in The Odyssey, and both Joan Collins and Kristen Johnston in The Flintstones in Viva Rock Vegas. ‎

MacKenzie is best known for dubbing Marge Simpson for the first fifteen seasons of The Simpsons. She dubbed Bette Midler in five movies, Sigourney Weaver in Ghostbusters 2, Joanna Lumley in James and the Giant Peach, Mary Wickes in Sister Act, and Catherine Bach on The Dukes of Hazzard.

Outside of The Simpsons, Mackenzie's cartoon roles include Clarabelle Cow and Cruella DeVil in various Disney projects, Wonder Woman on Superfriends, Miss Keane on The Powerpuff Girls, Kanga on The New Adventures of Winnie the Pooh, the narrator in the redub of Cinderella, and Mother Nature in the Mexican animated film Katy the Caterpillar. She acted in a few telenovelas in the 1960s.