Krzystof Charamsa, 43, was dismissed from his role as a senior Vatican official when he revealed he was in a same sex relationship just hours before the Catholic Church's Synod on the Family.
Now his diocese in Poland has confirmed he's been defrocked and is no longer able to celebrate mass or administer sacraments.
In a statement, the Diocese of Pelplin said the decision was taken "considering Father Charamsa's lack of will to correct his behaviour and public statements indicating he will continue to break rules governing the behaviour of Catholic priests,
It added: "This penalty is intended to encourage Father Charamsa to mend his ways and can be rescinded depending on his behaviour."