A 9mm submachine gun of German design, developed in the 1960s by a team of engineers from the German small arms manufacturer Heckler & Koch GmbH (H&K) of Oberndorf in Neckar. There are over 100 variants, including a semi-automatic version.

The MP5 is one of the most widely used sub-machine guns of the world, having been adopted by 40 nations and numerous military, law enforcement, intelligence, and security organizations. In the 1990s, Heckler & Koch developed Heckler & Koch UMP, the successor of MPS being both available as of 2012.