| | MAWAD | | Men And Women Against Discrimination |
| | MAWOY | | May Angels Watch Over You |
| | MB | | Megabyte |
| | MB | | message board |
| | MBA | | Married But Available |
| | MBA | | Master of Business Administration |
| | MBCS | | multi byte character set |
| | MBFAM | | My Brother From Another Mother |
| | MBFF | | male best friend forever |
| | MBFF | | my best friend forever |
| | MBGF | | My Best Girl Friend |
| | MBGF | | My Best Girl Friends |
| | MBGITW | | managing by getting in the way |
| | MBGITW | | most beautiful girl in the word |
| | MBI | | Management Buy In |
| | MBLA | | Management by listening around |
| | MBM | | Magnetic Bubble Memory |
| | MBM | | management by means |
| | MBM | | Married Black Male |
| | MBN | | must be nice |
| | MBO | | Management Buy Out |
| | MBOTS | | may be offensive to some |
| | Mbps | | megabits per second |
| | MBUC | | Mind Bogglingly Unlikely Coincidence |
| | mbwa | | management by walking about |
| | mbwa | | management by walking around |
| | mbwa | | management by wandering around |
| | MC | | master of ceremonies |
| | MCBF | | Mean Cycles Before Failure |
| | mcibty | | my computer is better than yours |
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