R4M, abbreviation for Rakete 4 Kilogramm Minenkopf , also known by the nickname Orkan due to its distinctive smoke trail when fired, was a folding-fin air-to-air rocket used by the Luftwaffe at the end of World War II.

The R4M was used on several late war German combat aircraft, most notably the Messerschmitt Me 262, and could be fired from open ramps under aircraft wings