The Osage Nation, a Native American tribe in the United States, is the source of most other terms containing the word "osage". Osage can also refer to: Osage-orange, Maclura pomifera, a tree of the mulberry family Osage Indian murders (1921-1923), a group of murders investigated and solved by the United States Federal Bureau of Investigation that took place on the Osage Indian Reservation Osage River, a tributary of the Missouri River, entirely contained in Missouri, United States The TH-55 O… (More on Osage)