In the Catholic Church, the ordinary ministers of the sacraments are ordained clergy (bishops, priests, and deacons). However, there are specific circumstances where a lay person can validly administer a sacrament:
* Baptism: In cases of necessity, *anyone* (including a non-baptized person) can validly administer baptism, provided they use water and the Trinitarian formula ("I baptize you in the name of the Father, and of the Son, and of the Holy Spirit").
* Marriage: In the Latin (Western) Catholic Church, the bride and groom administer the Sacrament of Marriage to each other. The priest or deacon present serves as the Church's official witness.
There is no specific term or title for a lay person who administers a sacrament in these circumstances. They are simply referred to as a lay person.