William H. Nicholas (October 10, 1892 – August 13, 1984) was an American Republican politician in the state of Iowa.
Born in Butler County, Iowa to William A. Nicholas and Elizabeth H. Nicholas, Nicholas raised turkeys in Cerro Gordo County, Iowa and served in the United States Navy during World War I. Nicholas served in the Iowa House of Representatives in 1947. Later he served as Lieutenant Governor of Iowa from 1951 to 1953 serving under Governor William S. Beardsley and from 1957 to 1959 serving under Governor Herschel C. Loveless. He died in Mason City, Iowa. Nicholas was a Freemason.
Nicholas married Viola Folkers of Allison, Iowa in 1922. He had three children, Idella, who married Harold Dukes and in 1957 was residing in Pinckney, Michigan; Bill, who succeeded him as manager of his turkey farm; and Bonnie, who married Edward Schick and in 1957 was residing in Mason City, Iowa. Nicholas had four grandchildren.