Who was the first woman prime minister in Australia?

By most accounts, the first woman prime minister in the world was Sirimavo Bandaranaike; she became Prime Minister of Sri Lanka (formerly called Ceylon) in 1960. Among other women to hold this office in the 1960s were Indira Gandhi, who became Prime Minister of India in 1966, and Golda Meir, who became Prime Minister of Israel in 1969. England got its first female Prime Minister in 1979 (and the first of any government in Europe), when Margaret Thatcher was elected. As for Canada, it only had one female Prime Minister and she served only six months in that office, from late June to early November 1993.