| Harold Barnett McSween | |
| State: | Louisiana |
| District: | 8th |
| Term Start: | January 3, 1959 |
| Term End: | January 3, 1963 |
| Succeeded: | Gillis William Long |
| Birth Date: | 19 July 1926 |
| Birth Place: | Alexandria, Louisiana, U.S. |
| Death Place: | Alexandria, Louisiana, U.S. |
| Resting Place: | Greenwood Memorial Park in Pineville, Louisiana |
| Party: | Democrat |
| Occupation: | Savings and loan association president |
| Alma Mater: | Louisiana State University |
| Branch: | United States Army Air Corps |
| Serviceyears: | World War II |
Harold Barnett McSween (July 19, 1926 - January 12, 2002), was a Louisiana politician who served in Louisiana's Eighth District for two terms as a Democrat.
McSween was born, and died, in Alexandria, Louisiana.