Willie's Shack is the home of Groundskeeper Willie. It is located at Springfield Elementary School's playground. It was once destroyed by Bart via loading it with purified cream corn delivered via a tanker in order to get his skateboard back. Another time, Bart was forced to use the shack to learn at school due to a restraining order imposed on him by his sister, Lisa Simpson, that technically barred him from entering the school.
- THOH – "Treehouse of Horror V"
- Episode – "The Canine Mutiny"
- Episode – "Girly Edition"
- Episode – "The Great Money Caper" (mentioned)
- Episode – "Little Girl in the Big Ten" (mentioned)
- Episode – "I'm Spelling as Fast as I Can" (mentioned)
- Episode – "The President Wore Pearls"
- Episode – "On a Clear Day I Can't See My Sister"