Cassius McDonald Barnes | |
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| 4th Governor of Oklahoma Territory | |
| In office May 24, 1897 – April 15, 1901 | |
| Appointed by | William McKinley |
| Preceded by | William Cary Renfrow |
| Succeeded by | William Miller Jenkins |
| Personal details | |
| Born | August 25, 1845 Livingston County, New York, U.S. |
| Died | February 18, 1925 (aged 79) Albuquerque, New Mexico |
| Resting place | Summit View Cemetery in Guthrie, Oklahoma |
| Political party | Republican |
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Cassius McDonald Barnes (August 25, 1845 – February 18, 1925) was a soldier in the Union Army in the American Civil War and a lawyer and Republican politician who served as the fourth governor of Oklahoma Territory.