MNB may refer to:

MNB (TV channel), a Mongolian public television channel Merchants National Bank (disambiguation), several U.S. banks Monday Night Baseball, a live game telecast of Major League Baseball on NBC, ABC and ESPN Mongolian National Broadcaster, a public service broadcaster in Mongolia Moody National Bank, a bank in Galveston, Texas Belgian National Movement, a World War II Belgian Resistance group Hungarian National Bank (Magyar Nemzeti Bank), the Hungarian name of the central bank of Hungary Menadione Nicotinamide Bisulfite, a synthetic chemical compound – see Menadione MnB, manganese boride

See also Wikipedia:Mentorship noticeboard, sometimes referred to by the shortcut WP:MNB