Sandra "Sandy" Martin is an American actress, who has over 60 film credits and has been an actress, producer, director, and writer in professional theater productions. She is mostly known for her role as Grandma Dynamite in Napoleon Dynamite.
For Disney, she voiced Dorothy in Wander Over Yonder, Gertie in Big City Greens, and Grandma Paguro in Disney/Pixar's 2021 film Luca. She also played a nurse in Krippendorf's Tribe, an unnamed woman in Desperate Housewives, and Verna the Secretary in the 2019 live-action remake of Dumbo.