Basilian may refer to a number of groups who are followers of Saint Basil the Great and specifically to:

• Basilian monks (founded c. 356), monks who follow the rule of Saint Basil the Great, in modern use refers to monks of Eastern Catholic Churches
• Order of Saint Basil the Great or Basilian Order of Saint Josaphat (founded c. 1631), a Ukrainian Greek Catholic monastic order
• Basilian Salvatorian Order (founded 1683), a religious order of the Melkite Greek Catholic Church
• Basilian Chouerite Order of Saint John the Baptist (founded 1696), a religious order of the Melkite Greek Catholic Church
• Basilian Aleppian Order (founded 1697), a religious order of the Melkite Greek Catholic Church
• Basilian Chouerite Sisters (founded 1737), a religious order of the Melkite Greek Catholic Church
• Basilian Aleppian Sisters (founded 1740), a religious order of the Melkite Greek Catholic Church
• Congregation of St. Basil (founded 1822), a Roman Catholic order of priests now active in the Americas