The Meroka CIWS is a Spanish Navy 12 barrelled 20 mm CIWS, using twelve Oerlikon 20 mm/120 guns mounted in 2 rows of 6 guns each. The system's primary purpose is defence against anti-ship missiles, and other precision guided weapons. However it can also be employed against aircraft, ships and other small craft, coastal targets, and floating mines. The weapon is mounted primarily on Spanish naval vessels, from Frigate size and larger.
The term MeRoKa (from German Mehrrohrkanone, meaning multi-barrelled gun) can refer to weapons such as the Nordenfelt gun but is more commonly used referring to this naval CIWS defence system. The 'Meroka' was developed and produced by the Spanish firm FABA (Fabrica de Artilleria Bazan).