Martha Maria Yeardley Smith is a French-American actress, voice actress, writer, and artist, who is best known for her role of being the voice of Lisa Simpson, on the animated television series The Simpsons.

Her Disney roles include in the made-for-TV movie Toothless, where she played a gatekeeper. She also played Phyllis in the Revenge episode "Renaissance", Louise Fitzer in the Touchstone Television TV show, Herman's Head, Malory Moss in the ABC TV show, Sports Night, Mandy Teslow in Phil of the Future, and Mrs. Rawlings in the Smart Guy episode "Dumbstruck".

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