Jo Cals, Dutch lawyer and politician, Prime Minister of the Netherlands (born 1914)

Jozef Maria Laurens Theo "Jo" Cals was a Dutch politician of the Catholic People's Party (KVP) and jurist who served as Prime Minister of the Netherlands from 14 April 1965 until 22 November 1966.

The prime minister of the Netherlands or, before 1945, the chairman of the Council of Ministers is the de facto head of government of the Netherlands. Although the monarch is the de jure head of government, in practice the prime minister occupies this role as chair of the Council of Ministers, coordinating its policy with the rest of the cabinet. In his role as the de facto head of government, the prime minister also represents the Netherlands in the European Council. Forty-three incumbents have served in the position. The current prime minister since 2 July 2024 is Dick Schoof.