Léon Kengo wa Dondo (born Leon Lubicz; 22 May 1935) is a Congolese politician who served as the "first state commissioner" (a title equivalent to prime minister) several times under Mobutu Sese Seko in Zaïre.

Kengo, as one of the country's senior-most magistrates, supported the independence of the judiciary and, despite Mobutu's centralisation, interpreted the document as only veiling such autonomy, not eliminating it.

During the early 1990s Mobutu allowed a transitional parliament to be set up, and Kengo was chosen prime minister by it in 1994 as a candidate in an attempt to neutralise the challenge from the popular opposition politician Étienne Tshisekedi.

Shortly after the beginning of the Congo civil war, in December 1996, Kengo became the leader of a crisis cabinet which sought to defeat the rebellion of Laurent Kabila.

[10][11] On 21 January 2015 during the 2015 Congolese protests he met with American, Belgian, British and French diplomats who urged him to either suspend debate and voting on the election modifying law or to remove its controversial provisions.