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.

Wat Pah Nanachat is a Theravāda Buddhist monastery in northeast Thailand, about 15 kilometres from the city of Ubon Rachathani. It was established in 1975 by Ajahn Chah as a training community for non-Thais according to the norms of the Thai Forest Tradition. Resident monks, novices and postulants include a wide range of nationalities. The primary language of communication and instruction is English.