Nandinatha Sampradaya(नन्दिनाथ सम्प्रदाय) is a denomination of Hinduism that places great importance on the practice of yoga. It is related to the broader Nath Sampradaya.
The Nandinaatha Sampradaya traces its beginning to at least 200 BCE. Its founder and first known spiritual preceptor was the MahaRishi (Great Sage), Nandinatha. Nandinatha is said to have initiated eight disciples (Sanatkumar, Sanakar, Sanadanar, Sananthanar, Shivayogamuni, Patanjali, Vyaghrapada, and Tirumular) and sent them to various places to spread the teachings of Advaita Shaivism(non-dualistic Shaivism). Though some of these disciples were sent as far as China to spread the Shaiva Siddhanta philosophy of their Guru, the work of two is especially important.
Patanjali is remembered as the author of the Yoga Sutras. This crucial text is one of the most widely quoted and respected texts on the practice of Yoga. Its translations are studied today in Yoga Centers throughout the world. Most of the mystical, Sanskrit vocabulary of Yoga teachings are first codified in this text. The aShThanga (eight-limbed) process of Yoga comes from this text. The text contains a spiritual blueprint for using the physical body to yoke consciousness to the Divine source.
Tirumular authored the Tirumantiram, which is a well known Tamil text. The Tirumantiram is still chanted in Tamil Nadu. It covers a wide variety of topics and illuminates much of the esoteric mystical insight of this Sampradaya. It illustrates the life style and moral conduct advocated by this tradition. It provides much insight into the mystical meditations and tantras (techniques) valued by the Nandinatha Sampradaya. It places great emphasis on repetition of the panchakshara (or five lettered) mantra: "Om namah Shivaaya".
The teachings of the Nandinatha Sampradaya, value highly the necessity of a living preceptor to carry the unseen, energetic essence of these teaching to devotees. The Nandinatha Sampradaya is a Siddha Yoga Tradition ("Siddha" means literally attainment), and its Gurus have often demonstrated great mystical abilities and wisdom. It is said that these teachers have realized their oneness with the Supreme God (they call "Shiva") and have merged as completely as humanly possible with this Divine source of all. With such realization, it is said, comes limitless bliss and direct command of every power in the universe. There are many accounts of miraculous powers demonstrated by the Teachers of this lineage. It is taught that the aid of such a highly realized Siddha can greatly quicken spiritual practice. Some even say that without the diksha (initiation) of such teachers, the human instincts will always fail to lead to this highest Realization.