The M142 High Mobility Artillery Rocket System (HIMARS) is a light multiple rocket launcher developed in the late 1990s for the United States Army, mounted on a standard Army M1140 truck frame.

The HIMARS carries six rockets or one MGM-140 ATACMS missile on the U.S. Army's new Family of Medium Tactical Vehicles (FMTV) five-ton truck, and can launch the entire Multiple Launch Rocket System Family of Munitions (MFOM). HIMARS ammunition is interchangeable with the MLRS M270A1; however, it is only able to carry one pod rather than the standard two for the M270 and A1 variants.

The launcher is C-130 transportable.[9] The chassis was initially produced by BAE Systems Mobility & Protection Systems (formerly Armor Holdings Aerospace and Defense Group Tactical Vehicle Systems Division), the original equipment manufacturer of the FMTV. In 2010, production of the chassis was taken over by the Oshkosh Corporation. This ended in 2017;[10] both chassis and launcher system are now produced by Lockheed Martin Missiles & Fire Control in Camden, Arkansas.