| Cosmin Muj | |
| Fullname: | Cosmin Darius Muj |
| Birth Date: | 6 November 1988 |
| Birth Place: | Arad |
| Discipline: | AER |
| Club: | Urania Arad |
| Headcoach: | Maria Fumea |
| Assistcoach: | Claudiu Varlam |
| Show-Medals: | yes |
Cosmin Muj (born 6 November 1988 in Arad, Romania) is a Romanian aerobic gymnast.[1] He won one gold world championships medal on the group event and one bronze European championships medal on the trio event.[2]