M9

M9 or M-9 may refer to:

In aviation :
* Miles M.9 Master, a 1939 British 2-seat monoplane advanced trainer

In computers:
* M9-IX, a short name for the Moscow Internet Exchange

In firearms and military equipment:
* M9 pistol, a 9mm pistol
* M9, a variant of the M2 Half Track Car
* M9 bayonet, a United States military knife
* M9 Armored Combat Earthmover, a United States military earthmover
* M-9, the export name for the Chinese missile DF-15
* Grigorovich M-9, a Russian World War I-era biplane flying boat
* M9 Detector Tape, a method for detecting nerve agent exposure

In rail transport:
* M-9 (railcar), a proposed railcar to be used on the Long Island Rail Road.

In roads:
* M9 motorway, a motorway in Ireland
* M9 motorway, a motorway in Scotland
* M9 motorway in Pakistan, also known as Super Highway.
* M9 motorway in Belarus, also known as MKAD (Minsk Ring Road).
* M9 motorway, a motorway-grade segment of the N9 road in the Republic of Ireland
* M-9 (Michigan highway), a former state highway route in Michigan
* Russian route M9 is another name for the Baltic Highway in Russia
* Motor Sich Airlines (IATA airline designator: M9), a Ukrainian airline

In science:
* Messier 9 (M9), a globular cluster in the constellation Ophiuchus