Satyagraha (/ˈsɑːtjəˈɡrɑːhɑː/; Sanskrit सत्याग्रह, satyāgraha "insistence on truth") is a 1980 opera in three acts for orchestra, chorus and soloists, composed by Philip Glass, with a libretto by Glass and Constance DeJong.

Loosely based on the life of Mahatma Gandhi, it forms the second part of Glass's "Portrait Trilogy" of operas about men who changed the world, which also includes Einstein on the Beach and Akhnaten.

Glass's style can broadly be described as minimalist. The work is scored for 2 sopranos, 2 mezzo-sopranos, 2 tenors, a baritone, 2 basses, a large SATB chorus, and an orchestra of strings and woodwinds only, no brass or percussion. Principal roles are Sonja Schlesin, Mahatma Gandhi, Hermann Kallenbach and Parsi Rustomji.

The title refers to Gandhi's concept of nonviolent resistance to injustice, satyagraha, and the text, from the Bhagavad Gita, is sung in the original Sanskrit. In performance, translation is usually provided in supertitles.

Satyagraha was commissioned by the city of Rotterdam, Netherlands, and first performed at the Schouwburg [nl] (Municipal Theatre) there on September 5, 1980, by the Netherlands Opera, featuring the choir of the Rotterdam Conservatory and the Utrecht Symphony Orchestra [nl], conducted by Bruce Ferden [de].

The opera premiered in North America at the Artpark in Lewiston, New York, on July 29, 1981. That production was mounted later that year at the Brooklyn Academy of Music. The opera was also staged that same year by the Stuttgart Opera (which went on to perform the complete trilogy in 1990); this production was taped during its revival in 1983 and released on video.

The Lyric Opera of Chicago presented the first production by a major international opera company on September 28, 1987, at the Civic Opera House. Douglas Perry sang the role of Gandhi.

The UK premiere was a joint production by Bath Spa University and Frome Community College in the theatre of Kingswood School in Bath in 1997.