The Vatican announced his appointment as head of the ordinariate June 15, just one hour before his ordination Mass was set to begin in St. Mary's Cathedral, Perth. Father Entwistle is married and has two grown children.
Also June 15, as had been announced previously, the Congregation for the Doctrine of the Faith formally erected the personal ordinariate of Our Lady of the Southern Cross.
Earlier in the evening, around 40 former Perth Anglicans entered into full communion with the Catholic Church.
In his homily at Father Entwistle's ordination, Perth Archbishop Timothy Costelloe praised the priest for his courage, both in embracing Catholicism and in accepting his new role as ordinary.
"The rich Anglican tradition has formed and nourished you all and has been the home in which you have discovered the beauty and the call of God," the archbishop said.
"The gifts you bring ... will now be strengthened and deepened through this new outpouring of the Holy Spirit," he said.
In 2009, Pope Benedict issued the apostolic constitution "Anglicanorum coetibus," providing for the establishment of ordinariates for former Anglicans who join the Catholic Church while retaining some of their Anglican traditions, spirituality and prayer. The first ordinariate, Our Lady of Walsingham, was established in 2011. The personal ordinariate of the Chair of St. Peter, for former Anglicans in the United States, was erected in January.