Operation Atalanta, formally European Union Naval Force (EU NAVFOR) Somalia, is an ongoing counter-piracy military operation at sea off the Horn of Africa and in the Western Indian Ocean. It is the first naval operation conducted by the European Union (EU), in support of United Nations resolutions 1814, 1816, 1838, and 1846 adopted in 2008 by the United Nations Security Council. Since 29 March 2019, the operational headquarters is located at Naval Station Rota (NAVSTA Rota) in Spain, having moved from London as a result of the British withdrawal from the EU.
It is part of a larger global action by the EU to prevent and combat acts of piracy in the Indian Ocean, and it is the first EU naval operation to be launched. It cooperates with the multinational Combined Task Force 151 of the US-led Combined Maritime Forces (CMF) and NATO's anti-piracy Operation Ocean Shield.