| Arthur Bouvier|
|Hair||Bald (formerly blue)|
|Relatives|| Parents: Pépé Bouvier and Bambi Bouvier|
Wife: Liane Bouvier
|First Appearance||The Boy Who Knew Too Much|
Arthur's exact relationship within the Bouvier family is unknown, although it is implied he is Marge's brother or uncle. He has only been mentioned on one occasion, by Marge, who told Bart that he used to have a saying, "Shoot 'em all and let God sort 'em out," until one day he put his theory into practice, and it "took 75 federal marshals to bring him down." Shortly afterward, she briefly alluded to him to Bart when cautioning him about listening to voices in his head, as he did on one December morning (implied to be the same day he decided to put his saying into practice).
Arthur seems to be a source of shame and embarrassment to the family. After Marge finished telling Arthur's story to Bart, she said, "Now let's never speak of him again." The references to voices inside his head imply that he was mentally ill, presumably Schizophrenic.
Arthur died from pancreatic cancer in 1986 at age 60.