Dattatreya (Sanskrit: दत्तात्रेय, Dattātreya) or Datta is a Hindu Deity encompassing the trinity of Brahma, Vishnu and Shiva, collectively known as Trimurti. The name Dattatreya can be divided into two words - "Datta" (meaning given) and "Atreya" (meaning sage Atri). Atri sage was given the boon by supreme lord that He will come as his son, hence the name Dattatreya.

Various Hindu sect worship Him differently. In the Nath tradition, Dattatreya is recognized as an Avatar or incarnation of the Shiva and as the Adi-Guru (First Teacher) of the Adinath Sampradaya of the Nathas. Although Dattatreya was at first a "Lord of Yoga" exhibiting distinctly Tantric traits, he was adapted and assimilated into the more devotional (Sanskrit: bhakti) Vaishnavite cults; while still worshiped by millions of Hindus, he is approached more as a benevolent god than as a teacher of the highest essence of Indian thought. Dattatreya is credited as the author of the Tripura Rahasya given to Parasurama, a treatise on Advaita Vedanta.