Agni Yoga (Russian: А́гни Йо́га) or the Living Ethics (Russian: Жива́я Э́тика), or the Teaching of Life (Russian: Уче́ние Жи́зни), is a Neo-Theosophical religious doctrine transmitted by Helena Roerich and Nicholas Roerich from 1920. The term Agni Yoga means "Mergence with Divine Fire" or "Path to Mergence with Divine Fire". This term was introduced by the Roerichs. The followers of Agni Yoga believe that the teaching was given to the Roerich family and their associates by Master Morya, the guru of the Roerichs and of Helena Blavatsky, one of the founders of the modern Theosophical movement and of the Theosophical Society.

Agni Yoga is a path of practice in daily life. It is the yoga of fiery energy, of consciousness, of responsible, directed thought. It teaches that the evolution of the planetary consciousness is a pressing necessity and that, through individual striving, it is an attainable aspiration for mankind. According to Helena Roerich, Agni Yoga is the synthesis of all yogas. In all the ancient Hindu scriptures, the approaching Fiery Age was predicted. Agni–Fire, which to a varying degree is at the heart of all yogas, will saturate the atmosphere of our planet, and all the branches of yoga will be merged into a fiery synthesis. Agni Yoga is a fire baptism.

The most significant features of Agni Yoga are cosmism and universalism. They are expressed in the interpretation of any phenomena of human existence from the point of view of their cosmic significance and interrelation with the being of the universe.

Agni Yoga played a significant role in bringing knowledge of Asian religions to the Western world. Living Ethics has an international following and has thousands of adherents. The ideas of the Teaching of Life have exerted an influence on other esoteric movements and philosophies.

Agni Yoga is a synthesis of all yogas. In all the ancient Hindu scriptures the approaching Fiery Epoch has been predicted. It is said that Agni – the Fire that is found in varying degrees at the foundation of all yogas will saturate the atmosphere of our planet tremendously, and all the branches of yoga will be fused into a fiery synthesis. Verily, Agni Yoga is a fiery baptism.

The term Agni Yoga means "mergence with fire" in Sanskrit. This term was introduced to the Western public by Nicholas Roerich and Helena Roerich.

Agni (Sanskrit: अग्नि) is the Vedic and Living Ethics' "god of fire", who marks immortality and is the symbol of life. Agni is one of the highest gods in the Rigveda. In Agni Yoga it is the creative fire of the universe, the root of the "Fire of Space"; and the "psychic energy", the powers of the human mind and heart, particularly those manifesting in love, thought, and creativity. In the original myth found in many Indo-European cultures Agni is a bird-like being, that brings fire from the gods to mankind. Alternatively, this messenger brings an elixir of immortality from Heaven to Earth. In the early Vedic literature, Agni primarily connotes fire as a god, reflecting the primordial powers to consume, transform and convey.

Yoga (Sanskrit: योग; pronunciation^ⓘ) is one of the six orthodox schools of Hindu philosophy. There is a broad variety of yoga schools, practices, and goals in Hinduism, Buddhism, and Jainism. Yoga is a group of spiritual, mental, and physical practices or disciplines which originated in ancient India. The term Yoga has been applied to a variety of practices and methods. In Hinduism these include Jnana Yoga, Bhakti Yoga, Karma Yoga, Laya Yoga and Hatha Yoga. The term Rāja Yoga originally referred to the ultimate goal of yoga, which is Samadhi (Sanskrit: समाधि, Hindi pronunciation: [səˈmaːdʱi]), but was popularised by Swami Vivekananda as the common name for Ashtanga Yoga. In the Ashtanga Yoga tradition, Samadhi is the eighth and final limb identified in the Yoga Sutras of Patanjali.