"Lost Our Lisa" is the twenty-fourth and penultimate episode of the ninth season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on May 10, 1998. The episode contains the last appearance of the character Lionel Hutz. When Lisa learns that Marge cannot give her a ride to the museum and forbids her to take the bus, she tricks Homer into giving her permission. After Lisa gets lost, Homer goes looking for her and the two end up visiting the museum together.

Lisa Marie Simpson is a fictional character in the animated television sitcom series The Simpsons. She is the middle child of the Simpson family. Voiced by Yeardley Smith, Lisa was born as a character in The Tracey Ullman Show short "Good Night" on April 19, 1987. Cartoonist Matt Groening created and designed her while waiting to meet James L. Brooks. Groening had been invited to pitch a series of shorts based on his comic Life in Hell, but instead decided to create a new set of characters. He named the older Simpson daughter after his younger sister Lisa Groening Bartlett. After appearing on The Tracey Ullman Show for three years, the Simpson family were moved to their own series on Fox, which debuted on December 17, 1989.