M
- M.O.P. (Roc-A-Fella/Def Jam)
- Teairra Mari (Roc-A-Fella/Def Jam)
- MC Serch
- Memphis Bleek (Roc-A-Fella/Get Low/Def Jam)
- Mel-Low
- Mic D
- Christina Milian (Def Soul/Def Jam)
- MoKenStef (Outburst/Def Jam)
- The Murderers (The Inc./Def Jam)
- Keith Murray (Keith Murray)
- Musiq (Def Soul)
- Mike Spitz
Read more about this topic: List Of Former Def Jam Recordings Artists