Leah MacGrady

  is Lakewood Elementary School's lunch lady. She enjoys bingo and is friends with Grandma Thora. She is a wise, kind, and supportive friend to everyone.

During the episode "Draw!" Mrs. MacGrady listens to Francine and how her feelings are hurt. In order to let the other classmates know how she feels, she sets up a plan at the school carnival. She tells the others that when she gives them the cue they need to pull a rope, which will dump gloop on Francine. In the end the students don't follow through with their plan, as they realize that Francine is really hurt inside. Mrs. MacGrady had really set up balloons to fall on her instead.

In the episode "The Great MacGrady," she has cancer and loses her hair from the chemotherapy. By "Prunella and the Haunted Locker," also a season 13 episode, her hair has grown back. Her replacement in "The Great MacGrady" is her nephew, Skip Bitterman. When she returns in that episode, Skip calls her Aunt Leah, instead of Sarah. This continues on throughout the series. "Leah" could be referencing one of the writers of the episode, Leah Ryan, which the episode was dedicated to. Also revealed in "The Great MacGrady," Mrs. MacGrady has a sister, Martha, who stayed with her after she was diagnosed with cancer.

In Arthur, It's Only Rock and Roll, she is the keyboardist for U Stink.

In the episode "Arthur Accused!" it is revealed that her first husband's name is Chester.