Thomistic sacramental theology is St. Thomas Aquinas's theology of the sacraments of the Catholic Church. It can be found through his writings in the 13th-century works Summa contra Gentiles and in the Summa Theologiæ.
In the Catholic Church, there are seven sacraments: Baptism, Confirmation, Holy Eucharist, Penance, Extreme unction (also called "Anointing of the Sick"), Holy Orders, and Matrimony.
From Summa Contra Gentiles, Book 4:
Aquinas also states, in the Summa Theologica: "a sacrament is nothing else than a sanctification conferred on man with some outward sign. Wherefore, since by receiving orders a consecration is conferred on man by visible signs, it is clear that Order is a sacrament."
Thomistic sacramental theology was definitely confirmed by the Seventh Session (March 3, 1547) of the Council of Trent that elaborated 13 canons of the decree De sacramentis as a reply to the Protestant Reform (e. g. the Five solae).