Albert Kalonji (b. 1919 or 1929) is a Congolese politician best known for leading the short-lived secessionist state of South Kasai during the Congo Crisis. Kalonji, a Luba chief, was a leader (with Joseph Ileo) of a moderate faction of Prime Minister Patrice Lumumba's MNC.
Within days of being granted independence from Belgium, the new country (at the time called the Republic of the Congo) plunged into chaos; amid the turmoil, Moise Tshombe, president of Katanga Province, announced that "We are seceding from chaos," and declared Katanga's independence on 11 July 1960. Kalonji, partly motivated by tribal rivalries, followed suit shortly afterwards and declared the independence of the diamond-rich province of South Kasai on 8 August, giving himself the title Chef Suprême du Peuple Muluba et Protecteur Incontesté des Tribus Associées à son sort (French for Supreme Chief of the Muluba People and Uncontested Protector of the Associated Tribes).
During his brief tenure, Kalonji, who vehemently hated Lumumba (due to the slaughter of thousands of Luba, which Kalonji blamed on the central government), unsuccessfully sought American help in overthrowing Lumumba.
On 12 April 1961, Kalonji's father was granted the title Mulopwe (which roughly translates to "emperor" or "god-king"), but he immediately "abdicated" in favor his son. On 16 July, Kalonji rejected royalty status, but retained the title of Mulopwe and changed his name to Albert I Kalonji Ditunga.
Kalonji's reign, however, proved to be short-lived; after a four-month military campaign, the military of the central government managed to successfully capture South Kasai, and on 30 December, Kalongi was arrested. He did manage to escape shortly afterwards, and managed to maintain a government that lasted till October 1962.
Following Joseph Mobutu's 1965 coup, South Kasai was divided into two regions, partly to discourage future secessionist tendencies.
As of 2007, Kalonji is still living and retains the title Souverain Possesseur des Terres occupées par les Balubas (Sovereign Owner of the occupied Lands of the Baluba). He is the author of Memorandum: Ma lutte, au Kasai, pour la Verite au service de la Justice (published 1964) and Congo 1960. La Sécession du Sud-Kasaï. La vérité du Mulopwe (published 2005).