William Archibald Rae (May 3, 1875 – May 5, 1943) was a businessman and provincial level politician from Alberta, Canada.
Rae was instrumental in the founding of Grande Prairie, Alberta with his work as secretary-treasure in The Argonaut Company Ltd.
He was defeated by his former business partner Alphaeus Patterson in a closely contested three-way race.
Patterson retired at the end of his term and Rae ran for the second time in the 1917 Alberta general election, this time winning the Peace River district by a large margin.
Rae was defeated in a very close three-way contest, finishing just 42 votes behind Kennedy.