MUC
- Le Mans Union Club 72
- MUC1
- Magic User's Club
- Meritorious Unit Citation
- Meritorious Unit Commendation
- Message Understanding Conference
- Metastatic urothelial carcinoma
- Mid-Ulster Cup
- Minzu University of China
- Miracle Ultraviolence Connection
- Montreal Urban Community
- Mount Union College
- Multi-user chat
- Munich Airport
- Munich-Riem Airport
- Muć
- Southern Illinois University Edwardsville
- SuperMUC
- Tomcraft
- Underwater football