Association of Catholic Clergy Pacem in Terris (Czech: Sdružení katolických duchovních Pacem in terris, Slovak: Združenie katolíckych duchovných Pacem in terris), abbreviated SKD PiT or simply PiT, was a regime-sponsored organisation of Catholic clergy in Communist Czechoslovakia between 1971 and 1989. Its name was taken from the well-known encyclical Pacem in terris of the reform Pope John XXIII.