Satchidananda Saraswati (IAST: Saccidānanda Sarasvatī; 22 December 1914 – 19 August 2002), born as C. K. Ramaswamy Gounder and usually known as Swami Satchidananda, was an Indian yoga guru and religious teacher, who gained fame and following in the West.

He was the author of philosophical and spiritual books. He had a core of founding disciples who compiled his translations and updated commentaries on traditional handbooks of yoga such as the Yoga Sutras of Patanjali and the Bhagavad Gita for modern readers. His reputation was damaged in 1991, following accusations of sexual misconduct and molestation of minors.