M.B., _Medicinæ Baccalaureus_=Bachelor of Medicine.
M.B., _Musicæ Baccalaureus_=Bachelor of Music.
M.C. Member of Congress; Master of Ceremonies; Member of Council.
M.C.C. Member of the County Council; Marylebone Cricket Club.
M.C.P. Member of the College of Preceptors.
M.C.S. Madras Civil Service.