The 10.5 cm Leichtgeschütz 42, commonly the LG 42, was a German recoilless gun manufactured by Rheinmetall and used during World War II.

The development history of the LG 42 is not clear, but it seems obvious that the success of the company's 7.5 cm LG 40 during the Battle of Crete in 1941 spurred the Germans to continue development of recoilless guns in larger calibers.

It incorporated torque vanes in the jet nozzle to counteract the torque forces imparted by the round engaging the rifling and any clogged or eroded nozzles.

It also used the improved priming mechanism developed after the problems with the smaller weapon became apparent.

The LG 42-1 version was built using light alloys in parts of the carriage, but the LG 42-2 replaced these with ordinary steel as light alloys became too valuable later in the war.