| William McOuat Cottingham | |
| Office: | Member of the Legislative Assembly of Quebec for Argenteuil |
| Predecessor: | Georges-Étienne Dansereau |
| Successor: | Zoël Saindon |
| Term Start: | 1948 |
| Term End: | 1966 |
| Birth Date: | 8 January 1905 |
| Birth Place: | Lachute, Quebec |
| Death Place: | Montreal, Quebec |
| Party: | Union Nationale |
William McOuat Cottingham (January 8, 1905 - March 20, 1983) was a Canadian provincial politician. He was the Union Nationale member of the Legislative Assembly of Quebec for Argenteuil from 1948 to 1966. He was the Minister of Mines from 1954 to 1960. He was also mayor of Saint-Jérusalem-d'Argenteuil (Lachute), Quebec from 1951 to 1953.