The abbreviation “OP” following the name of a Catholic priest indicates membership in the Order of Preachers, more commonly known as the Dominican Order. For example, a priest named Father John Doe, if a member of the Dominican Order, would have his name listed as Father John Doe, OP. This signifies his adherence to the rules, traditions, and charism of the Dominican Order.
Identifying priests by their religious order is important for several reasons. It distinguishes them from diocesan priests, who are directly under the authority of a bishop. It also provides insight into their specific theological and spiritual formation, as different religious orders have distinct approaches and focuses. Historically, the Dominican Order, founded by Saint Dominic in the 13th century, has been known for its emphasis on preaching, teaching, and intellectual pursuits, contributing significantly to theological and philosophical discourse within the Church.
