Der evangelischen Missions-Anstalt Basel (1815-2001) was a Protestant non-denominational missionary society based in Basel, Switzerland. It was founded in 1815 after local Calvinists, and Lutherans from Württemberg had sworn 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 also 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.