| Marc De Block | |
| Birth Date: | 25 July 1945 |
| Birth Place: | Schelderode, Belgium |
| Currentteam: | Retired |
| Role: | Rider |
| Proyears1: | 1968–1969 |
| Proyears2: | 1970–1973 |
| Proyears3: | 1974–1975 |
| Proteam3: | Munck–Beck's |
| Proyears4: | 1975–1978 |
| Proteam4: | Hertekamp |
Marc De Block (born 25 July 1945) is a Belgian former professional racing cyclist.[1] He rode in the 1969 Tour de France.[2] [3] He also won the Belgian National Cyclo-cross Championships in 1976 and 1977.