MCR
- ARM architecture
- Aneel Mussarat
- Coenzyme-B sulfoethylthiotransferase
- Common room (university)
- Critical Mach number
- Dr. Marri Channa Reddy Human Resource Development Institute of Telangana
- MCR Hotels
- Manchester Calling
- Manchester City Region
- Marine Commando Regiment
- Marri Channa Reddy
- Maryport and Carlisle Railway
- Master control room
- Master of Clinical Research
- Maximum continuous rating
- Medical care ratio
- Micro carbon residue
- Midland Counties Railway
- Mineralocorticoid receptor
- Modena City Ramblers
- Multi-component reaction
- Multi-component refrigerant
- Muslim Community Radio
- Mutual Climatic Range
- My Chemical Romance
- RSX-11
- Romandy Citizens' Movement