Robert Menzies Mitchell (October 28, 1865 – February 6, 1932[1]) was a physician and political figure in Saskatchewan, Canada.

He represented Weyburn in the Legislative Assembly of Saskatchewan from 1908 to 1919 as a Liberal.

He was born in Pickering, Canada West, the son of James Mitchell and Elizabeth Rogers, and was educated in Orangeville and at Trinity University in Toronto, where he received an M.D.

In 1899, he came to Indian Head, Saskatchewan, later setting up practice in Weyburn.

Mitchell served as Speaker of the Legislative Assembly of Saskatchewan from 1917 to 1919.