The Vallombrosians (alternately spelled Vallombrosans, Vallumbrosians or Vallumbrosans) are a monastic religious order in the Catholic Church. They are named after the location of their motherhouse founded in Vallombrosa (Latin: Vallis umbrosa), situated 30 km from Florence on the northwest slope of Monte Secchieta in the Pratomagno chain. They use the abbreviation O.S.B. Vall. to distinguish themselves from the Benedictines, who use the abbreviation O.S.B.