"They Saved Lisa's Brain" is the twenty-second and penultimate episode of the tenth season of the American animated television series The Simpsons. It first aired on the Fox network in the United States on May 9, 1999. In the episode, after writing a thoughtful letter to the Springfield Shopper, Lisa is invited to join the Springfield chapter of Mensa. When Mayor Quimby later flees Springfield, the group takes control of the town, hoping to improve the lives of Springfieldians through the rule of the smartest. Meanwhile, Homer poses for a series of erotic photos.

Matt Selman is an American writer and producer.