Ajahn Sumedho is an American Buddhist monk. He was ordained in 1967, and was instrumental in establishing Wat Pa Nanachat in Thailand and the Cittaviveka and Amaravati monasteries in England. One of the most senior Western representatives of the Thai Forest Tradition of Theravāda Buddhism, Sumedho is considered a seminal figure in the transmission of the Buddha's teachings to the West.

The Kammaṭṭhāna Forest Tradition of Thailand, commonly known in the West as the Thai Forest Tradition, is a lineage of Theravada Buddhist monasticism.