Dom Prosper Guéranger, O.S.B., (1805 - 1875) was a French Benedictine monk and priest, who served as the founding Abbot of Solesmes Abbey, which re-established French monastic life after it had been wiped out by the French Revolution.

Guéranger was the author of The Liturgical Year, which covers every day of the Catholic Church's Liturgical cycle in 15 volumes. He was well regarded by Pope Pius IX, and was a proponent of the dogmas of papal infallibility and the Immaculate Conception.

Guéranger is credited with reviving the Benedictine Order in France, and the implementation of the Tridentine Mass in France. He is also regarded as the grandfather of the Liturgical Movement.