List of post-nominal letters (Vatican City)

This is a list of post-nominal letters given in Vatican City.

List

Institute	Post-nominal
Religious Institutes
Canons Regular	C.R. + Initials of specific Congregation e.g. C.R.I.C
Canons Regular of Premontré ("Praemonstratensians" or "Norbertines")	O.Praem.
Order of St Benedict ("Benedictines")	OSB
Order of Cistercians of Strict Observance ("Cistercians")	OCSO
Order of Preachers ("Dominicans" or "Blackfriars") Ordinis Praedicatorum	OP
Conventual Franciscans ("Franciscans" or "Greyfriars")	OFM Conv.
Capuchins Franciscans ("Capuchins")	OFM Cap.
Order of Friars Minor ("Franciscans")	OFM
Order of St Clare ("Poor Clares")	OSC
Order of St Augustine ("Augustinians")	OSA
Carmelites of the Ancient Observance ("Carmelites" or "Whitefriars")	O Carm.
Discalced Carmelites("Discalced Carmelites")	O.C.D.
Order of Servants of Mary ("Servites")	OSM
Brothers Hospitallers of St John of God ("St John of God Brothers")	OH
Society of Jesus ("Jesuits")	SJ or SI
Institute of the Blessed Virgin Mary ("Loreto Sisters")	IBVM
Vincentians	CM
Daughters of Charity	DC
Congregation of the Most Holy Redeemer ("Redemptorists")	C.Ss.R.
Congregation of the Passion ("Passionists")	C.P.
Congregatio Sancti Spiritus Holy Ghost Fathers	C.S.Sp.
Salesians	SDB
Society of the Divine Savior Salvatorians	SDB
Society of Mary ("Marists")	SM
Marist Brothers	FMS
Fratres Scholarum Christianorum ("De La Salle Brothers")	FSC
Religious Sisters of Mercy ("Mercy Sisters")	RSM
Religious Sisters of Charity ("Irish Sisters of Charity")	RSC
Presentation Sisters	IPBVM
Congregatio Fratrum Christianorum ("Congregation of Christian Brothers")	C.F.C.
Society of St Columban ("Columban Fathers")	SSC
Missionary Society of St Patrick ("Kiltegan Fathers")	SPS