Joseph Camilleri has been actively involved in the Pax Christi movement since 1969. He served as General Secretary of Pax Christi in England in 1970-72, facilitated the establishment of Pax Christi in the United States, and was the founding President of Pax Christi in Australia from 1974, a position he held for over 30 years. He continues to serve on the Executive Committee of the Victorian branch.