Arthur Bonnicastle (February 20, 1877 – May 30, 1923) was an Osage politician who served as the 8th elected principal chief of the Osage Nation from 1920 to 1922. Born in the Osage Nation, Indian Territory, Bonnicastle attended the Carlisle Indian School before enlisting in the United States Army in 1900. He served in the 9th Cavalry Regiment during the Boxer Rebellion and was discharged in 1903. After returning home, he entered tribal politics and served on the Osage Nation tribal council from 1908 to 1910 and 1922 until his death in 1923.
Bonnicastle served as a delegate to Washington D.C. for the Osage Nation in 1904, 1905, and 1906.[4][5][6]
In 1908, Bonnicastle ran for the Osage Nation tribal council and won the election.[7] He lost re-election in 1910. In 1920, he was elected the 8th principal chief of the Osage Nation. In 1922, he did not seek re-election as chief and instead ran for and won a tribal council seat. The Osage Nation reports that he fell off a train and died while returning from Washington D.C..[1] Newspapers reported that he died on Wednesday morning, May 30, 1923, in a hospital in Kansas City from an illness.[8][9][10]
^To Bury Osage Chief Saturday. Tribe to Conduct Traditional Rites for Arthur Bonnicastle. Kansas City Times, June 1, 1923, p. 2.
^Ex-Principal Chief of Osages Passes Away. Soldier of Boxer War, Member of Tribal Council. One of the Most Highly Educated of the Tribe. The Osage Journal (Pawhuska, Oklahoma), May 31, 1923.