Sahaja Yoga (सहज योग) is a new religious movement founded in 1970 by Nirmala Srivastava (1923–2011). Nirmala Srivastava is known as Shri Mataji Nirmala Devi (trans: Revered Immaculate Mother) or simply as "Mother" by her followers, who are called Sahaja yogis.

Practitioners believe that during meditation they experience a state of self-realization produced by kundalini awakening, and that this is accompanied by the experience of thoughtless awareness or mental silence.

Shri Mataji described Sahaja Yoga as the pure, universal religion integrating all other religions. She claimed that she was a divine incarnation, more precisely an incarnation of the Holy Spirit, or the Adi Shakti of the Hindu tradition, the great mother goddess who had come to save humanity. This is also how she is regarded by most of her devotees. Sahaja Yoga has sometimes been characterized as a cult.

The word 'Sahaja' in Sanskrit has two components: 'Saha' is 'with' and 'ja' is 'born'. A Dictionary of Buddhism gives the literal translation of Sahaja as "innate" and defines it as "denoting the natural presence of enlightenment (bodhi) or purity", and Yoga means union with the divine and refers to a spiritual path or a state of spiritual absorption. According to a book published by Sahaja Yogis, Sahaja Yoga means spontaneous and born with you meaning that the kundalini is born within us and can be awakened spontaneously, without effort.

The term 'Sahaja Yoga' goes back at least to the 15th Century Indian mystic Kabir and has also been used to refer to Surat Shabd Yoga. Sahaja can also mean 'comfortable', 'natural', or 'uncomplicated' in Hindi.

Before starting Sahaja Yoga, Srivastava had a reputation as a spiritual healer. In 1970, with a small group of devotees around her, she began spreading her message of Sahaja Yoga in India. As she moved with her husband to London, UK, she continued her religious activities there, and the movement grew and spread throughout Europe, by the mid-80's reaching North America. In 1989, Shri Mataji made her first trip to Russia and Eastern Europe. She did not charge for her classes, insisting that her lesson was a birthright which should be freely available to all. As of 2021, Sahaja Yoga has centers in at least 69 countries.

The movement claims Sahaja Yoga is different from other yoga/meditations because it begins with self realization through kundalini awakening rather than as a result of performing kriya techniques or asanas. This self realization is said to be made possible by the presence of Srivastava often through a photograph of her. The teachings, practices and beliefs of Sahaja Yoga are mainly Hindu-based, with a predominance of elements from mystical traditions, as well as local customs of India. There are however elements of Christian origin, such as the eternal battle between good and evil. References to a variety of other religious, spiritual, mystical as well as modern scientific frameworks are also interwoven in Srivastava's teachings, although to a lesser degree.

Religious sociologist Judith Coney has reported facing a challenge in getting behind what she called "the public facade" of Sahaja Yoga. She described Sahaja yogis as adopting a low profile with uncommitted individuals to avoid unnecessary conflict.