| Thierry Marichal | |
| Fullname: | Thierry Marichal |
| Birth Date: | 1973 6, df=yes |
| Birth Place: | Leuze-en-Hainaut, Belgium |
| Weight: | 72kg (159lb) |
| Currentteam: | Retired |
| Discipline: | Road |
| Role: | Rider |
| Proyears1: | 1996–1997 |
| Proteam1: | Cedico |
| Proyears2: | 1998–2004 |
| Proteam2: | Lotto |
| Proyears3: | 2005–2006 |
| Proteam3: | Cofidis |
| Proyears4: | 2007 |
| Proteam4: | Française des Jeux |
| Majorwins: | Tour de la Région Wallonne (1997) |
Thierry Marichal (born 13 June 1973 in Leuze-en-Hainaut) is a Belgian former professional road bicycle racer.