Cak (also spelt as Chak) is a member of the Luish branch of the Jingpho-Luish subgroup of Tibeto-Burman. Cak villages are mostly found in Baishari, Naikhyongchari and Dochari areas in the southeastern part of the Chittagong Hill Tracts, Bangladesh. The Cak people adhere to Theravada Buddhism. The Cak Speaking population is estimated to be 3,000 in Bangladesh. Therein, Cak can be classed as one of the most endangered languages. This book is the first attempt to compile a trilingual (Cak-English-Bangla) dictionary of the Cak language. The book also contains a grammatical sketch of the Cak language and a brief introduction to the Cak alphabet.