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Proper Abbreviation of "Servant of God" in Catholic Writings?
The Catholic abbreviation for a Servant of God is S.D. after the Latin equivalent Servus Dei!
S.D. — Servus Dei (Servant of God) - Ecclesiastical Abbreviations
If you reference the Servant of God, Fr. John Hardon S.J., you should print out his title as I just did for the first time in a document or letter. After this you could abbreviate his title to the S.D. John Hardon (SJ). The abbreviation S.J. for Societas Iesu could be omitted if desired.
The title Servant of God is not considered a canonical title in a strict sense by the Catholic Church, but only a technical term used in the process of canonization.