Order of Saint Basil the Great
| Latin: Ordo Sancti Basilii Magni | |
| Abbreviation | OSBM |
|---|---|
| Formation | 20 August 1631 |
| Founder | Saint Josaphat Kuntsevych |
| Type | Monastic order of pontifical right (for men) |
| Membership | 484 (338 priests) (2025) |
| Robert Lysseiko, OSBM | |
Parent organization | Greek Catholic Church |
The Order of Saint Basil the Great (Ukrainian: Чин Святого Василія Великого, romanized: Chyn Sviatoho Vasyliia Velykoho; Latin: Ordo Sancti Basilii Magni, abbreviated OSBM), also known as the Basilian Order of Saint Josaphat, is a Greek Catholic monastic order of pontifical right that works actively among Ukrainian Catholics and other Greek Catholic churches in central and Eastern Europe. The order received approbation on 20 August 1631 and is based at the Monastery of the Holy Trinity, Vilnius.