CMMB, short for Congregation of the Missionaries of Mariannhill, is a Catholic missionary religious congregation founded in 1909 by Abbot Francis Pfanner in Mariannhill, South Africa. The congregation focuses on carrying out missionary work, particularly in Africa, through various educational, healthcare, and social programs aimed at serving marginalized communities. CMMB is known for its dedication to promoting social justice, providing humanitarian aid, and fostering spiritual growth among the communities it serves.