M19

M19, M.19 or M-19 may refer to:

In science:
* Messier 19 (M19), a globular cluster in the constellation Ophiuchus

In history:
* 19th of April Movement (M-19), a former Colombian guerrilla movement and political party

In transportation:
* M-19 (Michigan highway), a state highway in Michigan

In firearms and military equipment:
* M19 mine, a United States anti-tank mine
* Smith & Wesson Model 19 (S&W M19), a Smith & Wesson revolver
* Mk 19 grenade launcher, a belt-fed automatic grenade launcher
* an internal Fokker designation for the Fokker D.III, a 1916 German single-seat fighter aircraft