The Vatican, which regards life as sacred from the moment of conception, said it was an "inevitable consequence" of the group's policy change.
Amnesty said it was not promoting abortion as a universal right.
But the group said that women had a right to choose, particularly in cases of rape or incest.
"No more financing of Amnesty International after the organisation's pro-abortion about-turn," said a statement from the Roman Catholic Church's Pontifical Council for Justice and Peace.
Full story:
BBC NEWS | Europe | Vatican urges end to Amnesty aid
