In 2006, O'Collins was made a Companion of the General Division of the Order of Australia (AC), in recognition of his outstanding commitment to theological scholarship and ecumenical initiatives.[4]
O'Collins organised and co-chaired international ecumenical symposia on the Resurrection (1996), the Trinity (1998), the Incarnation (2000), the Redemption (2003), and the legacy of Pope John Paul II (2008), also co-editing their proceedings.[8] He returned to Australia in 2009.
Pope John Paul II. A Reader (with D Kendall and J LaBelle) Paulist Press, 2007. ISBN 978-0809144792
Christ Our Redeemer. A Christian Approach to Salvation OUP, 2007. ISBN 978-0199203130
The Lord's Prayer Darton, Longman & Todd, 2006. ISBN 978-0809144884 (Paulist Press ed.)
Living Vatican II. The 21st Council for the 21st Century, Paulist Press, 2006 (awarded best theology book of 2006 by the Catholic Press Association of the United States and of Canada). ISBN 978-0809142903
Following the Way: Jesus Our Spiritual Director Paulist Press, 2000. ISBN 978-0809139842