Ajahn Pasanno (born Reed Perry, Manitoba, Canada, July 26, 1949) is the most senior Western disciple of Ven. Ajahn Chah in the United States, and most senior in the world after Ajahn Sumedho and Ajahn Khemadhammo. For many years he was the abbot of Wat Pah Nanachat International Forest Monastery in Northeast Thailand. In the late 1990s, Ajahn Pasanno moved to California to head the new Abhayagiri Monastery. With more than 40 years as a bhikkhu (Buddhist monk), Ajahn Pasanno has been instrumental in training many monks in Thailand and the United States and has been supportive of training for women.

On December 5, 2015, at the Temple of the Emerald Buddha (Wat Phra Kaeo) in Bangkok, Ajahn Pasanno received the honorary ecclesiastical title “Chao Khun” and name “Phra Bodhinyanavidesa” from the Crown Prince of Thailand, on behalf of His Majesty King Bhumipol Adulyadet. The title “Chao Khun” is given periodically to monks in the Thai tradition who have distinguished themselves with their contributions to the monastic tradition. This high honor is particularly significant as Western monks are rarely awarded this special recognition.