Missions-Anstalt Basel (1815 - 2001) was a Protestant non-denominational missionary society based in Basel, Switzerland. It was founded in 1815 after Calvinists, and Lutherans from Württemberg swore a holy oath to form a joint seminary school, eventually establishing the Basel Mission (initially founded as the German Missionary Society). In addition to local and German missionaries, the school trained prospects from Britain and the Netherlands. During its almost two centuries, the Basel Mission was active in Russia, India, China, Borneo, Cameroon, Ghana, Nigeria, Sudan, and Latin America. In 2001, the Basel Mission was subsumed under Mission 21, the new and largest multi-denominational missionary organization in Switzerland.