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Mitchigamea or Michigamea is an extinct language formerly spoken by the Mitchigamea people in Arkansas.
In 1673, Jacques Marquette and Louis Jolliet used a Mitchigamea man, who only spoke Illinois poorly, as a translator between the Illinois-speaking French, and the Siouan-speaking Quapaw. Jean Bernard Bossu provided two sentences from the mid-18th century which, according to John Koontz, indicate that Michigamea was a Siouan language of the Mississippi Valley branch.
References
"Front Page". puffin.creighton.edu. 11 August 2014. Retrieved 18 May 2017.
Koontz, John E. 1995. Michigamea as a Siouan language. Paper presented at the 15th annual Siouan and Caddoan Languages Conference, University of New Mexico - Albuquerque.