Sirima Ratwatte Dias Bandaranaike (, ; 17 April 1916 – 10 October 2000), commonly known as Sirimavo Bandaranaike (the suffix "vo" denotes respect), was a Sri Lankan politician and the modern world's first female head of government. She served as Prime Minister of Ceylon and Sri Lanka three times, 1960–65, 1970–77 and 1994–2000, and was a long-time leader of the Sri Lanka Freedom Party.