The United Kingdom's L16 81 mm mortar is the standard mortar used by the British armed forces. It originated as a joint design by UK and Canada. The version produced and used by Australia is named the F2 81mm Mortar, whilst the version used by the U.S. armed forces is known as the M252.

It was introduced in 1965/6 replacing the Ordnance ML 3 inch Mortar in UK service where it is used by the Army, Royal Marines and RAF Regiment.

In UK armoured or mechanised battalions the L16 mortar is mounted in a vehicle, usually the FV 432 AFV (two per mechanised battalion mortar platoon) or Bv 206 (or the M113 APC in the many armies that use it). Otherwise it is carried dissassembled in three loads each approximately 11 kg (barrel, baseplate and bipod with sights) normally by a vehicle or helicopter and assembled for firing from the ground.

The weapon can be man-packed by the mortar detachment, but this is an arduous task (especially for the carrier of the bipod) and is preferably avoided. The ammunition in this case would be carried by other soldiers of the battalion. In addition to his normal equipment, each man would carry four bombs in a pair of two-bomb, plastic containers, known as 'greenies'.