Djwal Khul (variously spelled 'Djwhal Khul', 'Djwal Kul', the 'Master D.K.', 'D.K.', or simply 'DK'), is believed by some Theosophists and others to be a Tibetan disciple in the tradition of ancient esoteric spirituality known as The Ageless Wisdom tradition. The texts describe him as a member of the 'Spiritual Hierarchy', or 'Brotherhood', of Mahatmas, one of the Masters of the Ancient Wisdom, defined as the spiritual guides of mankind and teachers ancient cosmological, metaphysical, and esoteric principles that form the origin of all the world's great philosophies, mythologies and spiritual traditions. According to Theosophical writings, Djwal Khul is said to work on furthering the spiritual evolution of our planet through the teachings offered in the 24 books by Alice Bailey of Esoteric Teachings published by The Lucis Trust; he is said to have telepathically transmitted the teachings to Bailey and is thus regarded by her followers as the communications director of the Masters of the Ancient Wisdom.
Djwal Khul's name first appeared in the work of Madame Blavatsky, a co-founder of the Theosophical Society and author of "The Secret Doctrine", published in 1888, which was primarily written by Koot Hoomi and Morya, according to Blavatsky and others in the Mahatma letters.
Bailey writes in August 1934, in the first person voice of DK: [I am] "a Tibetan disciple of a certain degree, and this tells you but little, for all are disciples from the humblest aspirant up to and beyond The Christ Himself. I live in a physical body like other men on the borders of Tibet and at times (from the exoteric standpoint) preside over a large group of Tibetan Lamas, when my other duties permit." In some writings, his name was omitted and he was referred to by the abbreviation "Master D. K." or the appellation "The Tibetan".
In 1919 Alice Bailey (1880–1949), severed her links with the Theosophical Society for various reasons and later began writing books she described as being telepathically dictated to her by Djwhal Khul whom she referred to as "The Tibetan" (later associated with the initials D.K.). According to Bailey, her D.K. was the main author behind Blavatsky's "The Secret Doctrine". Bailey stated that after initial resistance, she was eventually persuaded by the quality of what she had written in 'dictation' in the first few weeks work with DK to continue to write down the communications from this source. She wrote for 30 years, from 1919 to 1949.