12B is a 2001 Tamil movie. 12B may also refer to: * New York State Route 12B, a state highway in the central part of New York * Missouri Route 12B * Nebraska Spur 12B * WASP-12b, an extrasolar planet * HAT-P-12b, an extrasolar planet * 12B, a short-lived Mazda Wankel engine * 12B United States MOS enlisted (military occupational specialty) for " Combat Engineer"