The Crosiers or Brethren of the Cross or crutched friars is a general name for several loosely related Catholic orders, mostly canons regular. Their names derive from their devotion to the Holy Cross. They were founded in the 12th and 13th centuries, during the era of the crusades in the Holy Land. These orders tended to maintain hospitals and care for the sick. Currently, the term "crosiers" most frequently refers to the Canons Regular of the Order of the Holy Cross originating from Belgium, but it could also refer to at least five other orders from Jerusalem, Portugal, Italy, Bohemia, Poland–Lithuania, and a group of friars in England and Ireland.

The Crosiers, formally known as the Canons Regular of the Order of the Holy Cross, abbreviated OSC, is a Catholic religious order of canons regular of Pontifical Right for men. It is one of the Church's oldest religious orders, and membership consists of priests and brothers who live together according to the Rule of St. Augustine.