Joseph Marie Antoine Hubert Luns was a Dutch politician, diplomat and jurist who served as the fifth Secretary General of NATO from 1971 to 1984, being the longest-serving officeholder since the office was established in 1952. Prior to this, he was Minister of Foreign Affairs, starting in 1956. Luns was a member of the now-defunct Catholic People's Party (KVP), later merged into the Christian Democratic Appeal (CDA).
Luns attended Saint Ignatius Gymnasium in Amsterdam from April 1924 until June 1930. He was conscripted in the Coastguard of the Royal Netherlands Navy serving as a warrant officer from June 1930 until July 1931.