Mary Jo Catlett is an American actress. She is a main cast member on the animated series SpongeBob SquarePants, providing the voice of Mrs. Puff. She is also known for originating the role of Ernestina in the 1964 Broadway production of Hello, Dolly! and for playing Pearl Gallagher, the third housekeeper on Diff'rent Strokes.

SpongeBob SquarePants is an American animated television series created by marine science educator and animator Stephen Hillenburg that aired on Nickelodeon as a sneak peek after the 1999 Kids' Choice Awards on May 1, 1999, and officially premiered on July 17, 1999. It chronicles the adventures of the title character and his aquatic friends in the underwater city of Bikini Bottom. The series received worldwide critical acclaim, and has gained popularity by its second season. As of 2019, the series is the fifth-longest-running American animated series. Its popularity made it a multimedia franchise, the highest rated Nickelodeon series, and the most profitable intellectual property for Paramount Consumer Products. By 2019, it had generated over $13 billion in merchandising revenue.