William Cosgrove Milby (?-26 October 1877) was a Canadian politician. After being an unsuccessful candidate in the 1871 and 1875 provincial elections, he represented the electoral district of Kootenay from an August 24, 1876 by-election until his death in 1877.

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1877 deaths Independent MLAs in British Columbia 19th-century members of the Legislative Assembly of British Columbia {{Independent-BritishColumbia-MLA-stub