M9

M9, M-9 most often refers to:
 * Beretta M9, a 9 mm pistol

M9, M-9 or M09 may refer to:

Aviation

 * Grigorovich M-9, a Russian World War I-era biplane flying boat
 * Miles M.9 Master, a 1939 British 2-seat monoplane advanced trainer
 * Motor Sich Airlines, a Ukrainian airline (IATA airline designator: M9)

Computers

 * M9-IX, a short name for the Moscow Internet Exchange
 * Apple M9, one of the company's series of Apple motion coprocessors

Firearms and military equipment

 * Beretta M9, the standard-issue service pistol for the US Army and other forces
 * M9M1, a 9mm/.45ACP submachine gun
 * M-9, the export name for the Chinese missile DF-15
 * M9 half-track, a variant of the M2 Half Track
 * M9 bayonet, a United States military knife
 * M9 Armored Combat Earthmover, a United States military earthmover
 * M9 Anti-tank Rocket Launcher, another name for the bazooka
 * M9 flamethrower, flamethrower, United States
 * M9 Gun Director, director used with 90mm anti-aircraft guns
 * T40/M9 Tank Destroyer American tank destroyer

Science

 * Messier 9 (M9), a globular cluster in the constellation Ophiuchus
 * ATC code M09 Other drugs for disorders of the musculo-skeletal system, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * M9 medium, a salt medium for cultivating Escherichia coli

Transport

 * M9 (New York City bus), a New York City Bus route in Manhattan
 * M9, a Washington, D.C. Metrobus route
 * Sri Lanka Railways M9, Sri Lanka Railways diesel-electric locomotive
 * M9 (railcar), a Long Island Rail Road car
 * M9 (Istanbul Metro), a rapid transit rail line in Istanbul, Turkey
 * M9 (East London), a Metropolitan Route in East London, South Africa
 * M9 (Cape Town), a Metropolitan Route in Cape Town, South Africa
 * M9 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa
 * M9 (Pretoria), a Metropolitan Route in Pretoria, South Africa
 * M9 (Durban), a Metropolitan Route in Durban, South Africa
 * M9 (Port Elizabeth), a Metropolitan Route in Port Elizabeth, South Africa
 * M9 motorway (Ireland), a motorway-grade segment of the N9 road in Ireland
 * M9 motorway (Pakistan) in Pakistan, also known as Super Highway
 * M9 highway (Russia), another name for the Baltic Highway in Russia
 * M9 motorway (Scotland), a motorway in Scotland
 * Highway M09 (Ukraine)
 * M-9 (Michigan highway), a former state highway route in Michigan, USA
 * M9 Road (Zambia), a road in Zambia
 * AITO M9, an electric SUV
 * Bestune M9, a rebadged Hongqi HQ9 minivan

Other

 * Leica M9, a camera
 * Meizu M9, a smartphone with Android
 * HTC One M9, a smartphone with Android
 * "M9", a song by British band Boards of Canada, released on their Boc Maxima demo in 1996
 * "M9", a fictional British secret intelligence agency in the television spy show Danger Man
 * M9, a difficulty grade in mixed climbing