The Mystic Marriage of Saint Francis is a painting by the Italian Renaissance artist Sassetta, now in the Musée Condé in Chantilly, France.

Alternatively, the painting illustrates the public pronouncement of Saint Francis's vows according to the evangelical counsels of Poverty, Chastity, and Obedience.

[2] The scene is set in an idyllic landscape, between hills, castles and cultivated fields, without any attention to perspective and realism as in other Renaissance works.

Sassetta was in fact one of the last painters of the Sienese Gothic school, as shown by the use of elongated figures, the delicate colors and the courtly atmosphere.

The Mystic Marriage is said to have had a rectangular frame, meaning that it would have been in the lower register; more specifically, it would have been between the scenes involving Saint Francis's glory, on the left, and his death, on the right.