"Out of the devastation of World War II sprang the Australian Committee for the World Council of Churches (1946). This developed into the Australian Council of Churches which, in 1994, gave way to the National Council of Churches in Australia.
The movement for Christian unity in this country was, initially, an Anglican and Protestant affair. Eastern and Oriental Orthodox Churches came in, in strength, during the 1960s and 70s. For Catholics, the 2nd Vatican Council opened up fresh possibilities for relationships with other Churches, and the transition to the National Council of Churches in Australia (1994) saw the Catholic Church become a full participant in Australia’s national ecumenical body."
https://www.ncca.org.au/ncca-story/