M14, M-14, or M.14 may refer to:
- Highway M14 (Ukraine)
- M-14 (Michigan highway), a road connecting Ann Arbor and Detroit
- M14A (New York City bus) and M14D (New York City bus), two New York City Bus routes in Manhattan
- M14C (New York City bus), a defunct New York City Bus route in Manhattan
- M14 mine, a United States anti-personnel landmine
- Mk 14 Enhanced Battle Rifle, a United States battle rifle, designated marksman rifle
- AN/M14 incendiary grenade, a United States incendiary grenade
- M14 rifle, a United States military rifle
- M-14 rocket, an artillery rocket for the Russian BM-14 multiple rocket launcher.
- Chery M14, a retractable hardtop convertible manufactured by Chery Automobile, never went to production, leaving exclusively as concept car
- Macchi M.14, an Italian fighter aircraft of 1918
- Miles M.14 Magister, a 1937 British two-seat monoplane basic trainer aircraft
- Noble M14, a British prototype sports car
- Vedeneyev M14P, a Russian aircraft engine
- M14 (cell line), a human melanoma cell line
- March 14 Alliance, an Anti-Syrian Lebanese Coalition named after the date of their March 14, 2006 movement
- Messier 14, a globular cluster in the constellation Ophiuchus
- a size of ISO metric screw thread
- Magic 2014, a Magic: the Gathering expansion set
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