| Marc Zellweger | |
| Birth Date: | 1973 10, df=yes |
| Birth Place: | Winterthur, Switzerland |
| Height: | 1.81 m |
| Position: | Defender |
| Youthclubs1: | FC Seuzach |
| Years1: | 1994–2001 |
| Clubs1: | St. Gallen |
| Caps1: | 231 |
| Goals1: | 18 |
| Years2: | 2001–2002 |
| Clubs2: | 1. FC Köln |
| Caps2: | 13 |
| Goals2: | 1 |
| Years3: | 2002–2003 |
| Clubs3: | FC Wil |
| Caps3: | 25 |
| Goals3: | 1 |
| Years4: | 2003–2010 |
| Clubs4: | St. Gallen |
| Caps4: | 287 |
| Goals4: | 8 |
| Years5: | 2010–2012 |
| Clubs5: | SC Brühl |
| Caps5: | 48 |
| Goals5: | 6 |
| Totalcaps: | 604 |
| Totalgoals: | 34 |
| Nationalyears1: | 2000–2002 |
| Nationalteam1: | Switzerland |
| Nationalcaps1: | 13 |
| Nationalgoals1: | 0 |
Marc Zellweger (born 17 October 1973) is a Swiss former professional footballer who played as a defender. He spent most of his playing career at FC St. Gallen.