St. Mary's Monastery is a community of Roman Catholic Benedictine monks living a contemplative monastic life in Petersham, Massachusetts.

"In solitude and silence, by listening to the word of God, participating in divine worship, personal asceticism, prayer, mortification and the communion of fraternal love, they direct the whole of their lives and all their activities to the contemplation of God. In this way they offer the ecclesial community a singular testimony of the Church's love for her Lord, and they contribute, with hidden apostolic fruitfulness, to the growth of the People of God."

Pope St. John Paul II, Vita Consecrata 8