Pax Romana has been in communion with other Catholic organizations internationally and works closely with the Pontifical Council for the Laity, the Secretary of State of the Holy See, and the Pontifical Council for Justice and Peace, and the Pontifical Council for Culture and for Inter-religious Dialogue.
Pax Romana ICMICA/MIIC maintains a close working relationship with the members of the International Cooperation for Development and Solidarity (CIDSE), which is an international network of 15 Catholic development agencies.
Pax Romana also works with the Permanent Observers of the Holy See to the UN and UNESCO in Geneva, New York and Paris. Previously Pax Romana was an active member of the International Catholic Organization (ICO) and was part of the Conference of ICO. It is currently a member of the Forum of the Catholic NGOs.

