| William C. Harris | |
| Image Name: | William C. Harris circa 1976 (3x4).jpg |
| Caption: | official portrait, circa 1976 |
| Birth Date: | 7 May 1921 |
| Birth Place: | Pontiac, Illinois, U.S. |
| Office: | Illinois Commissioner of Banks and Trust Companies |
| Governor: | Jim Thompson |
| Term Start: | 1977 |
| Term End: | ??? |
| Office1: | President of the Illinois Senate |
| Term Start1: | January 10, 1973 |
| Term End1: | January 1975 |
| Preceded1: | Cecil A. Partee |
| Succeeded1: | Cecil A. Partee |
| Office2: | Member of the Illinois Senate |
| Term Start2: | 1961 |
| Term End2: | 1977 |
| Office3: | Member of the Illinois House of Representatives |
| Term Start3: | 1955 |
| Term End3: | 1961 |
| Party: | Republican |
William C. Harris (May 7, 1921 - December 30, 2004) was an American businessman and politician.
Born in Pontiac, Illinois, Harris served in the United States Navy during World War II. He then worked for his family's funeral home in Pontiac, Illinois and was in the insurance business. He served in the Illinois House of Representatives from 1955 to 1961 and was a Republican. Harris then served in the Illinois State Senate from 1961 to 1977. In 1968, Harris unsuccessfully ran for Auditor of Public Accounts. He was the president of the Illinois Senate during the 78th Illinois General Assembly. In 1976, he unsuccessfully ran for Illinois Secretary of State. In 1977, Harris was appointed Illinois Commissioner of Banks and Trust Companies.[1] [2] [3]