Giovanni Battista Scalabrini, CS was an Italian Catholic missionary who served as Bishop of Piacenza from 1876 until his death. He was the founder of both the Missionaries of Saint Charles and the Mission Sisters of Saint Charles.

The Congregation of the Missionaries of Saint Charles Borromeo, commonly called the Scalabrinian Missionaries, is a Catholic religious institute of brothers and priests founded by Giovanni Battista Scalabrini, Bishop of Piacenza in Italy, in 1887. The members of the congregation add the nominal letters CS after their names to indicate their membership in the Congregation. Its mission is to "maintain Catholic faith and practice among Italian emigrants in the New World." Today, they and their sister organizations, the Missionary Sisters of St. Charles Borromeo and the Secular Institute of the Scalabrinian Missionary Women minister to migrants, refugees and displaced persons.