About
Petrus Jozef Sietse "Piet" de Jong was a Dutch politician and naval officer who served as Prime Minister of the Netherlands from 1967 to 1971. He was affiliated with the Catholic People's Party (KVP). Prior to his political career, de Jong had a distinguished career in the Royal Netherlands Navy. His premiership was marked by economic growth and social reforms.
Career Timeline
Joins Royal Netherlands Navy
De Jong begins naval career.
State Secretary for Defence
Appointed to a senior position in defense.
Becomes Prime Minister
De Jong leads the Netherlands as Prime Minister.
Leaves Office
End of his premiership.
KVP Party Leader
Continues political involvement.
Death at age 101
Legacy as long serving PM.
Legacy as Former Prime Minister
Remembered for his service.
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Last updated: February 25, 2026