Octavius William Borrell was a Marist Brother, missionary school teacher and botanist.

The Marist Brothers of the Schools, commonly known as simply the Marist Brothers, is an international community of Catholic religious institute of brothers. In 1817, Marcellin Champagnat, a Marist priest from France, founded the Marist Brothers with the goal of educating young people, especially those most neglected. While most of the brothers minister in school settings, others work with young people in parishes, religious retreats and spiritual accompaniment, at-risk youth settings, young adult ministry and overseas missions.