Saint François d'Assise : Scènes Franciscaines, or simply Saint François d'Assise, is an opera in three acts and eight scenes by French composer Olivier Messiaen, who was also its librettist; written from 1975 to 1979, with orchestration and copying from 1979 to 1983. It concerns Saint Francis of Assisi, the titular character, and displays Messiaen's devout Catholicism.

Olivier Eugène Prosper Charles Messiaen was a French composer, organist, and ornithologist. One of the major composers of the 20th century, he was also an outstanding teacher of composition and musical analysis.