Phra Dharmakosācārya (Nguam Indapañño) (พระธรรมโกศาจารย์ (เงื่อม อินฺทปญฺโญ); ), also known as Buddhadāsa Bhikkhu (พุทธทาสภิกขุ; , 27 May 1906 – 25 May 1993) was a famous author and influential Thai ascetic-philosopher of the 20th century. Known as an innovative reinterpreter of Buddhist doctrine and Thai folk beliefs, Buddhadasa fostered a reformation in conventional religious perceptions in his home country, Thailand, as well as abroad. Buddhadasa developed a personal view that those who have penetrated the essential nature of religions consider "all religions to be inwardly the same", while those who have the highest understanding of dhamma feel "there is no religion".
He was born Nguam Phanit (เงื่อม พานิช; ) in 1906 in Ban Phumriang, Chaiya District, southern Thailand. His father, Sieng Phānit, was a shopkeeper of second generation Thai Chinese (Hokkien) ancestry and his mother, Klaun, was Southern Thai.
Buddhadasa renounced civilian life in 1926. Typical of young monks during the time, he traveled to the capital, Bangkok, for doctrinal training but found the wats there dirty, crowded, and, most troubling to him, the sangha corrupt, "preoccupied with prestige, position, and comfort with little interest in the highest ideals of Buddhism." As a result, he returned to his native rural district and occupied a forest tract near to his village, founding Suan Mokkh in 1932.
In later years, Buddhadasa's teachings attracted many international seekers to his hermitage. He held talks with leading scholars and clergy of various faiths. His aim in these discussions was to probe the similarities at the heart of each of the major world religions. Before his death in 1993, he established an International Dhamma Hermitage Center across the highway from his own retreat to aid in the teaching of Buddhism and other yogic practices to international students. The area of Suan Mokkh was expanded to
approximately 120 acres of forest.