The first woman prime minister in the world was Sirimavo Bandaranaike of Sri Lanka. She assumed office on July 21, 1960, becoming the world's first female prime minister. Bandaranaike served three terms as prime minister, and she was also known for having the longest tenure as a woman prime minister. She led the Sri Lanka Freedom Party and played a significant role in shaping the country's political landscape during her leadership. Sirimavo Bandaranaike was a pioneering figure in women's political leadership globally.