The Seventeen Tantras of the Esoteric Instruction Series (Tibetan: མན་ངག་སྡེའི་རྒྱུད་བཅུ་བདུན, Wylie: man ngag sde'i rgyud bcu bdun) or the Seventeen tantras of the Ancients (rnying-ma'i rgyud bcu-bdun) are an important collection of tantras in the Nyingma school of Tibetan Buddhism. They comprise the core scriptures of the "esoteric instruction series" (Menngagde) of Dzogchen teachings and are its most authoritative scriptures.