The 1884 Missouri Attorney General election was held on November 4, 1884, in order to elect the attorney general of Missouri. Democratic nominee and former speaker of the Missouri House of Representatives Banton G. Boone defeated Republican nominee Dan Murphy. The exact results of the election are unknown.

On election day, November 4, 1884, Democratic nominee Banton G. Boone won the election against his opponent Republican nominee Dan Murphy, thereby retaining Democratic control over the office of attorney general. Boone was sworn in as the 20th attorney general of Missouri on January 12, 1885.