|Prime Minister of Greece|
12 October 1989 – 23 November 1989
|Preceded by||Tzannis Tzannetakis|
|Succeeded by||Xenophon Zolotas|
|Born||23 February 1923|
Kato Tithorea, Greece
|Died||27 November 2016 (aged 93)|
|Alma mater||University of Athens|
Ioannis Grivas (Greek: Ιωάννης Γρίβας; 23 February 1923 – 27 November 2016) was a Greek judge, who served as President of the Court of Cassation and served as the Prime Minister of Greece at the head of a non-party caretaker government in 1989.
Grivas was born in Kato Tithorea, Phthiotis. He studied law at the University of Athens and in 1954 he became a judge. He took part as a judge in the Greek Junta Trials in 1975, and in 1979, he was appointed to the Supreme Court of Greece for Civil and Criminal Cases. He became vice-president of the court in 1986 and president in 1989–90.
In 1989, when the Greek Parliament was deadlocked between the PASOK and New Democracy parties following the 18 June 1989 elections, the Constitution requiring that the president of one of Greece's Supreme Courts be appointed interim Prime Minister, Grivas agreed to head a caretaker government to preside over fresh elections.
He took office on 12 October 1989 to lead the country to new elections, held on 5 November. After the elections produced another deadlocked Parliament, he resigned on 23 November 1989 in favour of Xenophon Zolotas, who formed a coalition government in which all three parliamentary parties participated. Grivas retired in 1990. He died on 27 November 2016, aged 93.
- "ΕΚΛΟΓΕΣ 9/2015: Οι πρωθυπουργοί μετά τη Μεταπολίτευση. 1989: ΙΩΑΝΝΗΣ ΓΡΙΒΑΣ" (in Greek). in.gr. 7 September 2015. Retrieved 15 September 2015.
- "Κυβέρνησις ΙΩΑΝΝΗ ΓΡΙΒΑ (Υπηρεσιακή) - Από 12.10.1989 έως 23.11.1989" (in Greek). General Secretariat of the Government. Retrieved 15 September 2015.
| Prime Minister of Greece
12 October – 3 November 1989
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