John J. Pettus (October 9 1813-1867) was a United States politican. A member of the Democratic party, he was Governor of the state of Mississippi from January 5 1854 to January 10 1854, and later was elected to a full term, from 21 November 1859 - 16 November 1863.

|- style="text-align: center;" | width="30%" |Preceded by:
William McWillie | width="40%" style="text-align: center;" |Governor of Mississippi
1859-1863 | width="30%" |Succeeded by:
Charles Clark