Operation Unokat, also styled Operation UNOKAT, was an offensive undertaken by United Nations peacekeeping forces from 5 December 1961 to 21 December 1961 against the gendarmerie of the State of Katanga, a secessionist state rebelling against the Republic of the Congo in central Africa. The United Nations had tried several times to reconcile the government of the Congo with the State of Katanga, which had declared independence under Moïse Tshombe with Belgian support in 1960.