| William Halsey | |
| Birth Date: | 1770 |
| Birth Place: | Short Hills, New Jersey |
| Death Date: | August 16, |
| Residence: | Newark, New Jersey |
| Office: | Mayor of Newark, New Jersey |
| Order: | 1st |
| Term Start: | 1836 |
| Term End: | 1837 |
| Predecessor: | None |
| Successor: | Theodore Frelinghuysen |
William Halsey (1770 – August 16, 1843) was the first Mayor of Newark, New Jersey serving from 1836 to 1837. He was 66 years of age and an attorney when elected. Halsey Street in downtown Newark is named after him. He also served as director of the Newark Aqueduct Company.[1]