Mwambutsa IV Bangiricenge (6 May 1912 – 26 March 1977) was the penultimate king (mwami) of Burundi who ruled between 1915 and 1966. He succeeded to the throne on the death of his father Mutaga IV Mbikije (reigned 1908–15). Born while Burundi was under German colonial rule, Mwambutsa's reign mostly coincided with Belgian colonial rule (1916–62). The Belgians retained the monarchs of both Rwanda and Burundi under the policy of indirect rule.
On 8 July 1966, a coup d'état took place in the Kingdom of Burundi. The second in Burundi's post-independence history, the coup ousted the government loyal to the king (mwami) of Burundi, Mwambutsa IV, who had gone into exile in October 1965 after the failure of an earlier coup d'état.
An attempted coup d'etat in Burundi took place between 18–19 October 1965, when a group of ethnic Hutu officers from the Burundian military and gendarmerie attempted to overthrow Burundi's government. The rebels were frustrated with the king (mwami) of Burundi, Mwambutsa IV, who had repeatedly attempted to cement his control over the government and bypassed parliamentary norms despite Hutu electoral gains. Although the prime minister was shot and wounded, the coup failed due to the intervention of a contingent of troops led by Captain Michel Micombero.
The attempted coup d'état provoked a backlash against Hutus in which thousands of people, including the participants in the coup, were killed. The coup also facilitated a militant Tutsi backlash against the monarchy resulting in two further coups which culminated in the abolition of the monarchy in November 1966 and the proclamation of a republic with Micombero as President of Burundi.