| William Campbell | |
| Order: | 2nd |
| Office: | Mayor of Saint John, New Brunswick |
| Predecessor: | Gabriel George Ludlow |
| Successor: | John Robinson |
| Term Start: | 1795 |
| Term End: | 1816 |
| Birth Place: | Argyllshire, Scotland |
| Death Place: | Saint John, Colony of New Brunswick |
William Campbell (1742 – February 10, 1823) was a Scottish-born political figure in the pre-Confederation Province of New Brunswick, Canada. He served as the second mayor of Saint John from 1795 to 1816.
William Campbell was born in 1742 in Argyllshire, Scotland. Early in his life, he emigrated to Worcester, Massachusetts, working as a merchant. Campbell later moved to New York and fought in the American Revolutionary War until 1783 when he evacuated to Halifax, Nova Scotia and later Saint John.[1] In 1795, Campbell succeeded Gabriel George Ludlow's position as the mayor of Saint John,[2] serving in this capacity until retiring in 1816 due to his age.[1] He died on February 10, 1823, at the age of 81.[3]