Jo Cals

Infobox Prime Minister
name =Jo Cals


order =Prime Minister of the Netherlands
term_start = 14 April 1965
term_end = 22 November 1966
deputy =
predecessor = Victor Marijnen
successor = Jelle Zijlstra
birth_date =birth date|df=yes|1914|7|18
birth_place = Roermond, Netherlands
death_date = death date and age|df=yes|1971|12|30|1914|7|18
death_place = The Hague, Netherlands
spouse =
constituency =
party = Katholieke Volks Partij
languagesspoken =

Jozef Maria Laurens Theo "Jo" Cals (18 July 1914–30 December 1971) was a Dutch politician. He served as minister of education and was Prime Minister of the Netherlands for little over a year, from 1965 until 1966, as a member of the Catholic KVP party.

After graduating from the University of Nijmegen in 1940, he practiced law in that same city up until 1950, in the meantime also teaching economics at his old secondary school in Roermond.In 1945 Jo Cals became leader of the Catholic Peoples Party (KVP) in the Nijmegen municipal council and three years later was elected to the Lower House of Parliament. From 15 March 1950 to 2 September 1952 he was State Secretary for Education, Arts and Sciences in the first and second Drees administrations. For the next eleven years he was Minister of Education, Arts and Sciences in the third and fourth Drees administrations, the second Beel administration and the De Quay administration.As minister of education he helped pass the "Mammoetwet," a law that transformed secondary education. In the debate, he spoke for 6 hours and 50 minutes, setting a record. The cabinet he had formed in 1965 fell as the result of a crisis, known as the "Night of Schmelzer."