| Honorific-Prefix: | The Hon. |
| William Roche | |
| Office1: | Member of the Nova Scotia House of Assembly for Halifax County |
| Term Start1: | 1886 |
| Term End1: | 1897 |
| Constituency Mp2: | Halifax |
| Parliament2: | Canadian |
| Alongside2: | Robert Borden |
| Predecessor2: | Benjamin Russell |
| Term Start2: | 1900 |
| Term End2: | 1904 |
| Successor3: | Adam Brown Crosby |
| Alongside3: | Michael Carney |
| Term Start3: | 1904 |
| Term End3: | 1908 |
| Office4: | Senator for Halifax, Nova Scotia |
| Appointed4: | Wilfrid Laurier |
| Term Start4: | 1910 |
| Term End4: | 1925 |
| Birth Date: | 11 February 1842 |
| Birth Place: | Halifax, Nova Scotia |
| Party: | Liberal |
| Relations: | Charles Roche, uncle |
William Roche (February 11, 1842 - October 19, 1925) was a Canadian politician and merchant.
Born in Halifax, Nova Scotia, he was the son of William Roche and Susan Manning and was educated at the Halifax Academy and the Free Church Academy. Roche married Clara MacLean of Pictou. He served as an alderman for Halifax from 1849 to 1850. Roche was vice-president of the Union Bank of Canada and President of the Halifax Fire Insurance Company.[1] Roche served as a member of the Legislative Assembly of Nova Scotia from 1886 to 1897. From 1896 to 1897, he was a Minister Without Portfolio and Member of the Executive Council. He was elected to the House of Commons of Canada for the electoral district of Halifax in the 1900 federal election. A Liberal, he was re-elected in 1904 and was defeated in 1908. He was summoned to the Senate of Canada on the advice of Wilfrid Laurier representing the senatorial division of Halifax, Nova Scotia in 1910. He served until his death in 1925.
His uncle Charles Roche served in the Nova Scotia assembly.[2]