Mona M. Ianotti (born August 31, 1947), who goes by the stage name Mona Marshall, is an American voice actress. She is most well known for voicing many of the female characters (e.g. Sheila Broflovski, Linda Stotch, etc.) on Comedy Central's landmark animated series South Park, replacing the late Mary Kay Bergman (who voiced on the show), after she died during the show's first three years.

Her Disney roles have included Aquata in The Little Mermaid series, the red elephant in The Lion King 1 1/2 and the additional voices in Wreck-It Ralph, Kinect Disneyland Adventures, Tangled, The Princess and the Frog, Get A Horse!, Frozen, the English dubs of Studio Ghibli films (such as Ponyo, The Cat Returns and Spirited Away) The Wild, Chicken Little, Treasure Planet, Monsters, Inc., Monsters University, Inside Out, The Hunchback of Notre Dame, Dumbo's Circus, the Nurse and the Witch in the Miramax Films version of The Thief and the Cobbler.