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Udasi is a religious sect of ascetics centred in northern India. Rising to prominence in the 17th century, and gaining control of Sikh shrines in the 18th century, they were notable interpreters of the Sikh philosophy during that time. The Udasi Mahants became the traditional custodians of the sacred shrines of the Sikhs during that time. Their religious practices bordered on a syncretism of Sikh and Hindu beliefs, and they often practiced deity worship. The Udasis professed the Sikh religion of Guru Nanak and did not conform to the Khalsa appearance as ordained by the last guru. For the Singh Sabha reformers, the Udasi Mahants constituted the "internal other" that had to be purged. According to the Akalis, the Mahants stood accused of propagating practices contrary to what they deemed real Sikh teachings. 
The word Udasi is derived from the Sanskrit word udasin, meaning 'detached, journey', reflecting an approach to spiritual and temporal life, or from udas ('detachment'), signifying indifference to or renunciation of worldly concerns. The sect is based on the teachings of Guru Nanak's elder son Sri Chand (1494–1643), who, contrary to his father's emphasis on participation in society, propagated ascetic renunciation and celibacy. Another Sikh tradition links the Udasis to Baba Gurditta, the eldest son of Guru Hargobind, and there is dispute on whether the Udasis originated with Sri Chand or Gurditta.
They maintain their own parallel line of gurus from Guru Nanak, followed by Sri Chand, followed by Gurditta. They first came to prominence in the 17th century, and gradually began to manage Sikh shrines and establishments in the 18th century, from where they espoused a model of Sikhism that diverged considerably from that of the Khalsa. They would set up establishments across North India through to Benares, where they would come to be ideologically joined with monastic asceticism. The combination of Hindu gods and the Sikh religious text indicated that the sect evolved over time under many historical influences and conditions, interpreting the message of Guru Granth Sahib in monistic Vedantic terms. They were initially largely based in urban centers where they set up their establishments, or akharas, only beginning to spread into rural areas during Sikh rule; before, they had around a dozen centres; by the end of Maharaja Ranjit Singh's reign, the number had increased to around 250. The Udasis widely propagated its form of Sikh philosophy, and during the 18th and the early 19th centuries, their teachings attracted a large number of people to the Sikh fold.
Before the emergence of the Singh Sabha Movement in the late 19th century, they controlled important Sikh shrines, including the Harimandir Sahib for a short while. However, during the Akali movement of the 20th century, the Khalsa Sikhs expelled them from the Sikh shrines, accusing them of vices and of indulging in ritual practices that were against the teachings of the Sikh gurus. The Sikh Gurdwara Reform Act, 1925 defined the term "Sikh" in a way that excluded the syncretic groups like Udasis, Nanakpanthis, and other groups who maintained transitional identities. Subsequently, the Udasis increasingly identified themselves as Hindus rather than Sikhs.
According to 18th-century descriptions, they either cut or matted their hair under a turban, rather than knot it under a turban like Khalsas, and instead of the Khalsa emphasis on the panj kakkar garb and sporting arms, their dress code would include items such as a cap, a cotton bag, a flower rosary, a vessel made of dried pumpkin, a chain around the waist, ash to smear on their body, and a deerskin upon which to perform Hatha yoga, resulting in an extremely divergent appearance from Khalsa Sikhs in the eighteenth century. In addition to not consider the Khalsa's Rehat Maryada to be binding on them, their modes of thought and attitude towards salvation also differed significantly. The Khalsa believed that salvation could be attained while taking part in society and pursuing secular objectives like political power and accumulation of resources like agrarian land, though this had to be accomplished within a particular framework of beliefs and spiritual practices, chief among which was the societal order and structure of the Khalsa. The Udasis considered secular pursuits to be incompatible with personal salvation, which was to be achieved only through renouncing the world, espousing asceticism and a monastic traveler lifestyle. Udasis are known for their Akharas along with the Nirmala sect of Sikhism.
The Udasis also worship the panchayatana, the five Hindu deities: Shiva, Vishnu, Durga, Ganesha, and Surya.
Traditionally, there were four Udasi centres (akharas or dhuans[what language is this?]) with each controlling a certain preaching area; Nanakmatta, Kashmir, Malwa (Punjab) and Doaba. There is an Udasi gurudwara (temple) in Amritsar, near the Harimandir Sahib (Golden Temple).
Today's Udasi are predominantly located in northwestern India especially around Punjab Haryana, Gujarat and cities like Haridwar and New Delhi; they are divided into three major groups: