Willett S. Main (August 15, 1828 – July 5, 1902) was an American politician.
Born in Edmeston, New York, Main moved with his family to Waukesha County, Wisconsin Territory in 1846 and then to Madison, Wisconsin Territory in 1847 and was a farmer and merchant. He served as sheriff and under-sheriff of Dane County, Wisconsin and was a deputy United States Marshal. He served in the Wisconsin State Senate, as a Republican, from 1888 to 1892. He died near Madison, Wisconsin. His brother was Alexander H. Main who served in the New York State Assembly.
- 'Proceedings of the State Historical Society of Wisconsin at its Annual Meeting,' Wisconsin Historical Society: 1903, Wisconsin Necrology-1902, pg. 145
- 'Wisconsin Blue Book 1891,' Biographical Sketch of Willett Main, pg. 583
- 'Biographical Review of Dane County, Wisconsin,' Biographical Review Publishing Company, Chicago, Illinois: 1893, vol. 1, pg. 176-178, vol. 2, pg. 603-604
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