Mona Marshall (born Mona M. Ianotti on August 31, 1947) is an American voice actress. She is often cast in the role of a young boy, usually ones who are smart or detached or somewhat psychotic. Her roles have included parts in not only Japanese anime, but also in American cartoons as well. Mona Marshall has recently lent her voice to the talking bear Koby the Study Buddy. In recent times her most notable roles are that of playing Sheila Broflovski, Linda Stotch, and additional voices on the popular television show South Park.

Best known for providing young male voices to characters in several Japanese animations, cartoons and video games to distinguish them as being older or wiser.