The Apostolic Nunciature to Saint Lucia is an ecclesiastical office of the Catholic Church in Saint Lucia. It is a diplomatic post of the Holy See, whose representative is called the Apostolic Nuncio with the rank of an ambassador. The title Apostolic Nuncio to Saint Lucia is held by the prelate appointed Apostolic Nuncio to Trinidad and Tobago; he resides in Trinidad and Tobago.