S

  • Sacrament of Penance – commonly called Confession, Reconciliation or Penance, becoming free of sin by confession and repentance
  • Sacred congregation – see: Congregation (Roman Curia)
  • Sacred Tradition
  • Saints, Communion of – see: Communion of Saints
  • Sanctifying grace – see: Grace (Christianity)
  • Sanctuary
  • Secular clergy
  • Secular institute
  • Sede vacante
  • See, Episcopal – see: Episcopal see
  • Seminarian
  • Server – see: Altar server
  • Side altar
  • Simple vow – any vow which is not a solemn vow
  • Sister
  • Society of apostolic life
  • Solemn vow
  • Stoup, Holy water – see: Holy water font and Home stoup
  • Summa Theologiæ — a theological work by Thomas Aquinas
  • Supreme Pontiff – see: Pontiff