| William Smithe | |
| Order: | 7th Premier of British Columbia |
| Term Start: | January 29, 1883 |
| Term End: | March 28, 1887 |
| Predecessor: | Robert Beaven |
| Successor: | Alexander Edmund Batson Davie |
| Lieutenant Governor: | Clement Francis Cornwall Hugh Nelson |
| Office1: | MLA for Cowichan |
| Term Start1: | October 16, 1871 |
| Term End1: | March 28, 1887 |
| Predecessor1: | first member |
| Successor1: | Henry Fry |
| Alongside1: | John Paton Booth, Edwin Pimbury, Henry Croft |
| Birth Name: | William Smith |
| Birth Date: | June 30, 1842 |
| Birth Place: | Matfen, England |
| Death Place: | Victoria, British Columbia |
| Party: | None |
| Spouse: | Martha Kier |
William Smithe (born William Smith; June 30, 1842 in Matfen, Northumberland, England – March 28, 1887 in Victoria, British Columbia) was a British Columbia politician.
Smithe was born William Smith in England and moved to Canada in his youth, settling on Vancouver Island in 1862 as a farmer. In 1871, he ran and won a seat in the new provincial legislature. There he added the final "e" to his name. Amor De Cosmos, also then a member of the legislature, had likewise been born as "William Smith," but in a characteristically grand gesture had legally adopted instead a new name meaning "Love of the Universe."
By 1875 Smithe had become the informal leader of the opposition to Premier George Anthony Walkem's government, but yielded the leadership to Andrew Charles Elliott. Smithe was in Elliott's short lived cabinet from 1876 to 1878 before returning to the opposition benches and again became opposition leader.
In 1883, Smithe became the seventh premier of British Columbia and initiated the Great Potlatch era in which governments made generous grants of public resources and land to private entrepreneurs. He also settled disputes with the federal government which had stalled the construction of the transcontinental Canadian Pacific Railway. Asked on one occasion whether he thought British Columbia should be annexed to the United States, he suggested instead that Washington and Oregon be annexed to British Columbia. Smithe remained premier until he died in office in 1887.