The Simpsons feature many episodes which are not considered to be official in The Simpsons timeline, and as such the information is regarded as non-canon. Any article about a character, place or object which only appears in these episodes, or sections in an article about these events, should have the {{Noncanon}} template added to it. Below is a list of episodes, games and comics considered non-canon.
Episodes
- Treehouse of Horror
- Treehouse of Horror II
- Treehouse of Horror III
- Treehouse of Horror IV
- Treehouse of Horror V
- Treehouse of Horror VI
- Treehouse of Horror VII
- Treehouse of Horror VIII
- Treehouse of Horror IX
- Treehouse of Horror X
- Treehouse of Horror XI
- Treehouse of Horror XII
- Treehouse of Horror XIII
- Treehouse of Horror XIV
- Treehouse of Horror XV
- Treehouse of Horror XVI
- Treehouse of Horror XVII
- Treehouse of Horror XVIII
- Treehouse of Horror XIX
- Treehouse of Horror XX
- Treehouse of Horror XXI
- Treehouse of Horror XXII
- Treehouse of Horror XXIII
- Treehouse of Horror XXIV
- Treehouse of Horror XXV
- Treehouse of Horror XXVI
- Treehouse of Horror XXVII
- Treehouse of Horror XXVIII
- Treehouse of Horror XXIX
- Treehouse of Horror XXX
- Treehouse of Horror XXXI
- Treehouse of Horror XXXII
- The Simpsons 138th Episode Spectacular
- The Simpsons Spin-Off Showcase
- Simpsons Bible Stories (The dreams only)
- Missionary: Impossible
- Behind the Laughter
- Gump Roast
- Simpson Christmas Stories
- Moe Goes from Rags to Riches
- Brick Like Me (The dreams only)
- Every Man's Dream
- The Serfsons
- Thanksgiving of Horror
The stories/dreams in:
- Treehouse of Horror
- Treehouse of Horror II
- Treehouse of Horror III
- Simpsons Tall Tales
- Tales from the Public Domain
- Margical History Tour
- The Wettest Stories Ever Told
- Revenge is a Dish Best Served Three Times
- Love, Springfieldian Style
- Four Great Women and a Manicure
- The Fight Before Christmas
- Brick Like Me
- Every Man's Dream
- Flanders' Ladder
- Now Museum, Now You Don't
- I, Carumbus
- All scenes and episodes that show predicted futures:
Games
All video games featuring Treehouse of Horror or other non-canon characters are considered non-canon.
- Bart vs. The Space Mutants
- The Simpsons Arcade Games
- The Simpsons: Bart vs. the World
- Bart's House of Weirdness
- The Simpsons: Bart vs. The Juggernauts
- Krusty's Fun House
- Bartman Meets Radioactive Man
- Bart's Nightmare
- Bart Simpson's Escape from Camp Deadly
- The Simpsons: Bart & the Beanstalk
- Virtual Bart
- The Itchy & Scratchy Game
- Itchy & Scratchy in Miniature Golf Madness
- The Simpsons Cartoon Studio
- The Simpsons: Virtual Springfield
- The Simpsons Bowling
- The Simpsons Wrestling
- The Simpsons: Night of the Living Treehouse of Horror
- The Simpsons Road Rage
- The Simpsons Skateboarding
- The Simpsons: Hit and Run
- The Simpsons Game
- The Simpsons: Minutes to Meltdown
- LEGO Dimensions