Dadoo Dayal (1544–1603) was a sant from Gujarat, India. "Dadoo" means brother, and "Dayal" means "the compassionate one".

He was reputedly found by an affluent business man floating on the river Sabarmati. He later moved to Naraina (city), near Jaipur Rajasthan, where he gathered around himself a group of followers, forming a sect that became known as the Dadoopanth.

This organization has continued in Rajasthan to the present-day and has been a major source of early manuscripts containing songs by Dadoo and other North Indian saints. Dadu's compositions were recorded by his disciple Rajjab and are known as the Dadoo Anubhav Vani, a compilation of 5,000 verses. Another disciple, Janagopal, wrote the earliest biography of Dadoo.

Dadoo alludes to spontaneous (sahaja) bliss in his songs. Much of the imagery used is similar to that used by Kabir, and to that used by earlier Sahajiya Buddhists and Nath yogis. Dadoo believed that devotion to God should transcend religious or sectarian affiliation, and that devotees should become non-sectarian or nipakh.^[1]

Dadoo had 100 disciples that attained samadhi. He instructed additional 52 disciples to set up ashrams, 'Thambas' around the region to spread the Lord's word. Dadoo ji spent the latter years of his life in Naraiana, a small distance away from the town of Dadoo, near Jaipur city. Five thambas are considered sacred by the followers; Naraiana, Bhairanaji, Sambhar, Amer, and Karadala (Kalyanpura). Followers at these thambas later set up other places of worship.

• Bakshi, S.R. and Mittra, Sangh eds. (2002) Sant Dadu Dayal: Encyclopaedia of Saints Series (Volume 25), Criterion Publications, New Delhi, India. ISBN 81-7938-029-7

• Dadu Dayal at Kavita Kosh (Hindi)
• The Biography of Dadu Dayal