William A. Kay (February 22, 1864 – November 27, 1931) was an American farmer and politician.

Born in Martell, Wisconsin, Kay was a farmer and served in town government. He served in the Wisconsin State Assembly in 1909, 1911, 1915, and 1931 as a Republican. He died in Madison, Wisconsin while still in office.Wisconsin Blue Book 1931, "Biographical Sketch of William A. Kay", pg. 237Laws of Wisconsin 1931-1932, Wisconsin Legislative Bureau: 1933, "Joint Resolution 3, William A. Kay", pg. 116-117

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