| Bartholomew JoJo Simpson, Jr. | |
| Bart Simpson, Jr.jpg | |
| Gender | 
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| Other status(es) | Fictional |
| Status | 
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| Hair | Yellow |
| Age | 10 |
| Occupation | Student |
| Relatives | Father: Bart Simpson Grandfather: Homer Simpson Grandmother: Marge Simpson Aunts: Lisa Simpson and Maggie Simpson Uncles: Hugo Simpson II and Milhouse Van Houten Grandaunts: Patty Bouvier and Selma Bouvier Half-Grandaunt: Abbie Simpson Half-Granduncle: Herb Powell Great-Grandfathers: Clancy Bouvier and Abraham Simpson Great-Grandmothers: Jacqueline Bouvier and Mona Simpson Great-Grandaunts: Gladys Gurney, Charlene Bouvier and Hortense Simpson Great-Granduncles: Lou Gurney, Chester Bouvier, Arthur Bouvier, JoJo Bouvier, Herman Bouvier, Karl Olsen, Cyrus Simpson, Bill Simpson, Chet Simpson, Hubert Simpson, Fester Simpson and Tyrone Simpson Step-Great-Grandmother: Rita LaFleur First-Cousins-Twice-Removed: Dot Gurney, Pierre Bouvier, Alfreda Bouvier II, Dorothé Bouvier, Rowena Bouvier, Tootsie Bouvier, Marnie Simpson, Omar Simpson, Bernie Olsen, Frank Simpson, Valerie Rothman, Unnamed and Dr. Simpson Half-First-Cousin-Once-Removed: Jessie Simpson Second-Cousins-Once-Removed: Stanley Simpson, Axel Bouvier, Polly Bouvier, Holly Bouvier, Lolly Bouvier and Dolly Bouvier Double-Second-Cousins-Once-Removed: Brit, Lily, and Magpie Simpson Adoptive-First-Cousin-Once-Removed: Ling Bouvier Great-Grandaunts-in-Law: Alfreda LeDoux and 15 unnamed First-Cousins-Twice-Removed-in-Law: Miranda Potter and Dave Rothman Great-Great-Grandfathers: Orville Simpson, Bjorn Olsen, Pépé Bouvier, and Ferdinand Gurney Great-Great-Grandmothers: Yuma Hickman, Bambi Petitbois, and Alvarine Bisque |
| First Appearance | "Bart Gets An F" |
| Voiced By | Nancy Cartwright |
Bartholomew JoJo Simpson, Jr. is an imaginary son of Bart Simpson.