The Istituto Mater Boni Consilii or the Institute of the Mother of Good Counsel is a Traditionalist Catholic congregation of priests who follow the Sedeprivationist school of thought.
The founders of the Institute seceded in 1985 from the Society of St. Pius X under the leadership of Fr. Francesco Ricossa; the three other founders were Frs. Franco Munari, Curzio Nitoglia (who returned to the SSPX) and Giuseppe Murro. The Institute is confined to Western Europe, and is strongest in Italy, France and Belgium. It operates a seminary at Verrua Savoia near Turin, Italy. It resembles the American-based Society of St. Pius V in that it rejects the use of the 1962 edition of the Mass, preferring the earlier version codified by Pius X.
The needs of the Institute are met by Bishop Geert Jan Stuyver, who belongs to it. Previously, Bishop Franco Munari, who had been a member, ministered to its needs.
The Institute also uses the name Sodalitium Pianum as an alternative name; this was the name of an unofficial group of theologians and others set up in the early twentieth century by Umberto Benigni to report to him those thought to be teaching Modernist doctrines.