- MTOR
- MTPN
- MTR
- MTR4
- MTRF1
- MTRF1L
- MTRR
- MTSS1
- MTSS1L
- MTTP
- MTUS1
- MTX2
- MTX3
- Mu Opioid Receptor 1
- MUC1
- MUC12
- MUC13
- MUC15
- MUC16
- MUC17
- MUC19
- MUC2
- MUC20
- MUC21
- MUC3A
- MUC3B
- MUC4
- MUC5AC
- MUC5B
- MUC6
- MUC7
- Mucin 22
- Mucolipin 3
- MUDEN
- MUL1
- Multicilin
- Multimerin 1
- MUM1
- MUM1L1
- MUP1
- MUP2
- Mup20
- MUP3
- MUP4
- Mup6
- MURC
- Murinoglobulin 1
- Murinoglobulin 2
- MUS81
- Muscarinic Acetylcholine Receptor M2