The M19 60mm light mortar is a lightweight, smoothbore muzzle-loading infantry support weapon developed and produced by the United States. It was developed during World War II for support actions as a reusable, high angle of fire weapon system to replace the existing M2 mortars. Development of the M19 began in 1942 under the name T18E6. The M5 conventional mount for the M2 was fitted to this weapon.

Of conventional mortar design by most respects, the M19 closely resembled the British 2-inch mortar family. Its launch tube could fire projectiles of 60mm caliber with warheads that include high explosive (HE), illumination, and smoke rounds. The M19 could be called upon to “light up” the immediate battlefield at night or offer protective “walls” of moving smoke to help conceal movements during the daytime. The crew actuated the M19 by placing an armed projectile down the smoothbore muzzle. The base would the contact the firing pin to enact the projectile’s propellant, sending it across he pre-determined trajectory. Muzzle velocity was calculated at 550 feet per second while the effective range was approximated at 5,870 feet.
The M19 mortar fired the same ammunition that the M2 mortar, which it would eventually replace. The help keep the system as lightweight as possible, a simplified spade baseplate was used as part of the M1 mount. This allowed for complete freedom when addressing the traverse angles and elevation.

Operators of the M19 mortar include Belgium, Canada, Greece, Japan, Lithuania, Luxembourg, Philippines, Thailand, Turkey, and the United States.