Karya Kepausan Indonesia (KKI) is a vital institution dedicated to supporting the papal mission of evangelization in Indonesia. Established in 1919, KKI functions under the auspices of the Pontifical Mission Societies, which collectively aim to inspire a missionary consciousness among Catholics globally. The organization comprises four key societies: the Pontifical Society for the Propagation of Faith, Pontifical Society of St. Peter Apostle, Pontifical Society of The Holy Childhood, and the Pontifical Missionary Union for Priest, Religious and Laity.

KKI operates seeking to raise awareness and responsibility for the Church's universal mission throughout Indonesia. Over the decades, it has evolved from its humble beginnings during the colonial era to a robust national office that engages actively with dioceses across the country. KKI provides resources including spiritual materials, mission promotion events, and educational support for children and youth, ensuring the continuity of the Church's mission in the region. Its headquarters in Jakarta serves as a central hub for its diverse activities and outreach initiatives.