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MP5 (from German: Maschinenpistole 5, "machine pistol model 5") is 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 am Neckar.

MP5 is currently one of the most widely used submachine guns in the world,having been adopted by numerous military, law enforcement, intelligence and security organizations. In the 1990s, Heckler & Koch developed the Heckler & Koch UMP, the MP5's successor, though both remain in production.

U.S. Navy SEALs armed with MP5s on a training exercise.