Panagiotis Kanellopoulos or Panayotis Kanellopoulos (Greek: Παναγιώτης Κανελλόπουλος; Patras, Achaea, 13 December 1902 – Athens, 11 September 1986) was a Greek author, politician and Prime Minister of Greece. He was the Prime Minister of Greece deposed by the Greek military junta of 1967-1974.
He studied law in Athens, Heidelberg and Munich. Kanellopoulos was an intellectual and author of books about politics, law, sociology, philosophy, history etc. His book "I was born in 1402" received a literary award from the Academy of Athens. He married Theano Poulikakos (Greek: Θεανώ Πουλικάκου).
He served as Minister of Defence under the Tsouderos government in exile during World War II. In November 1945, he served as Prime Minister for a short period of time. After the war he became Minister for Reconstruction under Georgios Papandreou in a national unity government. He also served in other ministerial posts under Alexandros Diomidis, Constantine Karamanlis and others till 1967 when he became Prime Minister.
On 9 July 1961 Panagiotis Kanellopoulos as Deputy Prime Minister in Konstantinos Karamanlis' government and German Vice-Chancellor Ludwig Erhard signed the protocols of Greece's Treaty of Association with the European Economic Community (EEC). The signing ceremony in Athens was attended by top government officials from the six-member group consisting of Germany, France, Italy, Belgium, Luxemburg and the Netherlands. The six member group was the early precursor of today's 25 member European Union. Economy Minister Aristidis Protopapadakis and Foreign Minister Evangelos Averoff were also present at the ceremony as well as Prime Minister Konstantinos Karamanlis.