| William Smith Peck Sr. | |
| Birth Date: | 1873 |
| Birth Place: | Catahoula Parish Louisiana, USA |
| Death Date: | 1946 (aged approximately 73) |
| Office: | Louisiana State Representative from Catahoula Parish |
| Term Start: | 1920 |
| Term End: | 1928 |
| Preceded: | L. Eugene Hooter |
| Succeeded: | H.W. LeTissier |
| Occupation: | Businessman |
| Party: | Democratic |
| Spouse: | Estelle Woodard Smith |
| Children: | William S. Peck Jr. Barbara Jane Peck Gilbert Henry C. Peck Sr. |
William Smith Peck Sr. (1873–1946) was a Democratic member of the Louisiana House of Representatives from Sicily Island in Catahoula Parish, Louisiana, having served from 1920–1928.[1] [2]