| William McAdam Nickle | |
| Office1: | Ontario MPP |
| Term Start1: | 1951 |
| Term End1: | 1963 |
| Predecessor1: | Harry Allan Stewart |
| Successor1: | Syl Apps |
| Constituency1: | Kingston |
| Party: | Progressive Conservative |
| Birth Date: | 4 January 1897 |
| Birth Place: | Kingston, Ontario |
| Death Place: | Collins Bay, Ontario |
William McAdam Nickle (January 4, 1897 – December 10, 1968) was an Ontario political figure. He represented Kingston in the Legislative Assembly of Ontario from 1951 to 1963 as a Progressive Conservative member.
He was born in Kingston, Ontario, the son of William Folger Nickle, and educated there and at Osgoode Hall. In 1925, he married Grace Dunlop. He served with the Princess Patricia's Canadian Light Infantry and was wounded in World War I. Nickle served in the provincial cabinet as Provincial Secretary and Registrar in 1955, Minister of Planning and Development from 1955 to 1961 and Minister Without Portfolio from 1961 to 1962. He died at his home after a long illness in 1968.[1]