The numeronym 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
• M19 Mortar
• M19 Tank Transporter
• M19 Gun Motor Carriage
• M19 Maschinengranatwerfer - a German mortar used during WW2

• Lithuania at the 2002 European Championships in Athletics
• Lithuania at the 2004 Summer Paralympics
• Lithuania at the 2005 World Aquatics Championships
• Lithuania at the 2006 European Championships in Athletics
• Lithuania at the 2007 World Aquatics Championships
• Lithuania at the 2008 European Track Championships
• Lithuania at the 2008 UEC European Track Championships
• Lithuania at the 2009 World Aquatics Championships
• Lithuania at the 2010 European Championships in Athletics
• Lithuania at the 2011 Summer Universiade
• Lithuania at the 2011 World Aquatics Championships
• Lithuania at the 2011 World Championships in Athletics
• Lithuania at the 2012 European Athletics Championships
• Lithuania at the 2012 Summer Paralympics
• Lithuania at the 2012 Winter Youth Olympics
• Lithuania at the 2013 Summer Universiade
• Lithuania at the 2013 World Aquatics Championships
• Lithuania at the 2013 World Championships in Athletics
• Lithuania at the 2013 World Weightlifting Championships
• Lithuania at the 2014 European Athletics Championships
• Lithuania at the 2014 FIBA Basketball World Cup
• Lithuania at the 2014 Summer Youth Olympics
• Lithuania at the 2014 Winter Olympics
• Lithuania at the 2015 European Games
• Lithuania at the 2015 Summer Universiade