M9 pistol, a 9mm pistol

M9 Armored Combat Earthmover, a United States military earthmover

M9, a variant of the M2 Half Track Car

M9 motorway, a motorway-grade segment of the N9 road in the Republic of Ireland

M9 bayonet, a United States military knife

M9 motorway, a motorway in Scotland

Grigorovich M-9, a Russian World War I-era biplane flying boat

M9 motorway in Pakistan, also known as Super Highway.

Motor Sich Airlines (IATA airline designator: M9), a Ukrainian airline

Messier 9 (M9), a globular cluster in the constellation Ophiuchus

M9-IX, a short name for the Moscow Internet Exchange

M-9, the export name for the Chinese missile DF-15

Russian route M9 is another name for the Baltic Highway in Russia

M-9 (Michigan highway), a state highway in Michigan

M9 motorway in Belarus, also known as MKAD (Minsk Ring Road).