Sir Quett Ketumile Joni Masire (born July 23, 1925) was President of Botswana for the Botswana Democratic Party from 1980 to 1998. He stepped down and was replaced by Festus Mogae.

Masire was born in Kanye. He worked as teacher and headmaster of the Seepapisto Secondary School from 1949 to 1955. In 1962 he was the co-founder of the Botswana Democratic Party (BDP). In 1965, partyleader Seretse Khama was elected prime minister of Botswana. After the independence of Botswana in 1966, he became Vice President of Botswana.

After President Seretse Khama died on 13 July 1980, Quett Masire was elected President of Botswana (18 July). Under Masire, Botswana remained a democratic and non-rassistic society. In 1998 he stepped down.

After his retirement as president he has been active in diplomacy, acting as a mediator in the civil war in the Democratic Republic of the Congo.