| William Murdoch Buchanan | |
| Constituency Mp: | Cape Breton North and Victoria |
| Parliament: | Canadian |
| Predecessor: | Matthew Maclean |
| Successor: | Bob Muir |
| Term Start: | 1953 |
| Term End: | 1957 |
| Birth Date: | 30 November 1897 |
| Birth Place: | North Sydney, Nova Scotia, Canada |
| Nationality: | Canadian |
| Party: | Liberal Party |
| Occupation: | dentist |
William Murdoch Buchanan (November 30, 1897 - September 5, 1966) was a Canadian politician. Born in North Sydney, Nova Scotia, Buchanan was elected to the House of Commons of Canada in the 1953 election as a Member of the Liberal Party to represent the riding of Cape Breton North and Victoria. He was defeated in the elections of 1957 and 1958.