| William C. Rybak | |
| State House: | Pennsylvania |
| District: | 135th |
| Term Start: | 1981 |
| Term End: | 1990 |
| Predecessor: | J. Michael Schweder |
| Successor: | Joseph Uliana |
| Term Start2: | 1969 |
| Term End2: | 1972 |
| Predecessor2: | District created |
| Successor2: | Thomas J. Maloney |
| State House3: | Pennsylvania |
| District3: | Northampton County |
| Term Start3: | 1967 |
| Term End3: | 1968 |
| Birth Date: | 2 March 1921 |
| Birth Place: | New York City, New York[1] |
| Death Place: | Bethlehem, Pennsylvania |
| Party: | Democratic |
William C. Rybak (March 2, 1921 – February 3, 2004) was a Democratic member of the Pennsylvania House of Representatives. He was a member from the Northampton County district (1967-1972) and from the 135th district (1981-1990).[2]