| Honorific-Prefix: | The Hon. |
| William McDonald | |
| Constituency Mp: | Cape Breton |
| Parliament: | Canadian |
| Alongside: | Newton LeGayet Mackay (1872-1878) Hugh McLeod (1878-1879) William Mackenzie McLeod (1879-1882) Murray Dodd (1882-1884) |
| Predecessor: | James Charles McKeagney |
| Successor: | Hector Francis McDougall |
| Term Start: | 1872 |
| Term End: | 1884 |
| Office2: | Senator for Cape Breton, Nova Scotia |
| Appointed2: | John A. Macdonald |
| Term Start2: | 1884 |
| Term End2: | 1916 |
| Birth Date: | 7 October 1837 |
| Birth Place: | Inverness, Nova Scotia |
| Party: | Conservative |
William McDonald (October 7, 1837 - July 4, 1916) was a Canadian politician.
Born at the Settlement of River Deny's Road, Inverness, Nova Scotia, the son of Mary McDonald and Allan McDonald, who emigrated from South Uist, Scotland, McDonald was educated at St. Francois Xavier College, Antigonish, Nova Scotia.
A merchant, he was first elected to the House of Commons of Canada for Cape Breton in the 1872 federal election. A Conservative, he was re-elected in 1874, 1878, and 1882. In 1884, he was called to the Senate on the advice of John Alexander Macdonald representing the senatorial division of Cape Breton, Nova Scotia. He served for almost 44 years as a member of parliament and senator until his death in 1916.[1]
The intersection of Main, Union and Commercial streets in downtown Glace Bay is named "Senator's Corner" in his honour.[2]