Yvonne Adélaïde Moundélé-Ngollo (born 1944) is a Congolese politician who has served in the government of Congo-Brazzaville as Minister of Small and Medium-Sized Enterprises since 2007. She was previously Director-General of Hydro-Congo from 1998 to 1999 and Minister of Trade from 2002 to 2007.
Moundélé-Ngollo was born in Brazzaville. She is a daughter of Édouard Mougany, who was a member of the National Assembly and an ally of President Fulbert Youlou. Her first husband was Ange Diawara, a military officer and early leader of the Congolese Labour Party (PCT) who was executed in 1973 for his role in the 1972 coup plot. She later married another politician, Benoît Moundélé-Ngollo, who served as a government minister, as Mayor of Brazzaville, and as Prefect of Brazzaville.
After holding high-level posts at Hydro-Congo, the national oil exploration and exploitation company (including the post of Director of the Department of Studies and Planning from 1986 to 1994), Moundélé-Ngollo was an Adviser to the Minister of Hydrocarbons from 1994 to 1998. She also attended the United Nations Fourth World Conference on Women as a delegate from Congo-Brazzaville in September 1995. Moundélé-Ngollo was the Director-General of Hydro-Congo from December 1998 to December 1999. She later became a member of the National Executive Bureau of Club 2002, which supports President Denis Sassou Nguesso and is led by his nephew, Willy Sassou Nguesso.
After the May–June 2002 parliamentary election, Moundélé-Ngollo was appointed as Minister of Trade, Consumption, and Supplies on 18 August 2002, and she succeeded Pierre-Damien Boussoukou Boumba in that position on 21 August. In late 2002 and early 2003, she played a key role in peace initiatives regarding the Ninja rebellion, led by Pasteur Ntoumi; a peace agreement was signed on 17 March 2003, and she became a member of the Monitoring Committee of the Convention for Peace and National Reconstruction.