Catholic Charities USA is the national voluntary membership organization for Catholic Charities agencies throughout the United States and its territories. Catholic Charities USA is a member of Caritas Internationalis, an international federation of Catholic social service organizations. Catholic Charities USA is the national office of 167 local Catholic Charities agencies nationwide.

Caritas Internationalis is a confederation of 162 national Catholic relief, development and social service organizations operating in over 200 countries and territories worldwide. The name Caritas Internationalis refers to both the global network of Caritas organizations and to its general secretariat based in the Vatican City in Rome, Italy.