| C. William Haines | |
| State Senate1: | New Jersey |
| District1: | 8th |
| Term Start1: | January 8, 1985 |
| Term End1: | December 18, 1996 |
| Predecessor1: | Jim Saxton |
| Successor1: | Martha W. Bark |
| State Assembly2: | New Jersey |
| District2: | 8th |
| Term Start2: | January 12, 1982 |
| Term End2: | January 8, 1985 |
| Alongside2: | Harold L. Colburn, Jr. |
| Predecessor2: | Jim Saxton Clifford W. Snedeker |
| Successor2: | Robert C. Shinn Jr. |
| Birth Date: | 2 November 1928 |
| Birth Place: | Mount Holly, New Jersey, U.S. |
| Death Place: | Mount Laurel, New Jersey, U.S. |
| Party: | Republican |
C. William Haines (November 2, 1928 – December 18, 1996) was an American Republican Party politician who served in the New Jersey General Assembly from the 8th Legislative District from 1982 to 1985 and in the New Jersey Senate from 1985 until his death in 1996.
He died of cancer on December 18, 1996, in Mount Laurel, New Jersey at age 68.[1]