'''M19''', '''M.19''', or '''M-19''' most commonly refers to: * May 19th Communist Organization (M19), an American far-left female-led group active during the 1970s–1980s * 19th of April Movement (M-19), a former Colombian guerrilla movement and political party 1970–1990
'''M19''', '''M.19''', or '''M-19''' may also refer to:
== In science == * Messier 19 (M19), a globular cluster in the constellation Ophiuchus
== In transportation == * M-19 (Michigan highway), a state highway in Michigan, U.S. * M19 (East London), a Metropolitan Route in East London, South Africa * M19 (Cape Town), a Metropolitan Route in Cape Town, South Africa * M19 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa * M19 (Pretoria), a Metropolitan Route in Pretoria, South Africa * M19 (Durban), a Metropolitan Route in Durban, South Africa * M19 (Bloemfontein), a Metropolitan Route in Bloemfontein, South Africa * M19 (Port Elizabeth), a Metropolitan Route in Port Elizabeth, South Africa * M19 expressway (Hungary) * M19 road (Zambia), a short road in Zambia
== 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 * M.19, an internal Fokker designation for the Fokker D.III, a 1916 German single-seat fighter aircraft * M19 mortar * M19 tank transporter * M19 gun motor carriage * M19 Maschinengranatwerfer – a German mortar used during WW2
{{Letter–number combination disambiguation}}