Ajahn Chah, Thai monk and educator (d. 1992)
Chah Subhaddo (Thai: ชา สุภัทโท, known in English as Ajahn Chah, occasionally with honorific titles Luang Por and Phra) also known by his honorific name "Phra Bodhiñāṇathera" (Thai: พระโพธิญาณเถร, Chao Khun Bodhinyana Thera; 17 June 1918 – 16 January 1992) was a Thai Buddhist monk. He was an influential teacher of the Buddhadhamma and a founder of two major monasteries in the Thai Forest Tradition.

Respected and loved in his own country as a man of great wisdom, he was also instrumental in establishing Theravada Buddhism in the West. Beginning in 1979 with the founding of Cittaviveka (commonly known as Chithurst Buddhist Monastery) in the United Kingdom, the Forest Tradition of Ajahn Chah has spread throughout Europe, the United States and the British Commonwealth. The dhamma talks of Ajahn Chah have been recorded, transcribed and translated into several languages.

More than one million people, including the Thai royal family, attended Ajahn Chah's funeral in January 1993 held a year after his death due to the "hundreds of thousands of people expected to attend". He left behind a legacy of dhamma talks, students, and monasteries.