Ioannis Sarmas (Greek: Ιωάννης Σαρμάς; born 21 March 1957) is a Greek judge and politician who briefly served as the caretaker Prime Minister of Greece in 2023. He was also the chairman of the Greek Court of Audit from 2019 to 2023.

Because the May 2023 Greek legislative election did not result in the formation of a new government, President Katerina Sakellaropoulou appointed him to be the caretaker Prime Minister of Greece on 25 May 2023, becoming the 100th holder of that office. He served as caretaker prime minister until the formation of the new government of Kyriakos Mitsotakis after the June 2023 election.^[1]

He was designated for the chairmanship of the Greek Court of Audit on 4 November 2019,^[2][3] serving a non-renewable four-year term as per the Constitution of Greece.

He served as a reserve officer at the Greek Air Force between 1984 and 1986. Prior to this, he studied law in Athens in the late 1970s and completed his postgraduate and doctorate studies in Paris from 1980 to 1985, with very good grades.

He began to serve the law system in January 1987, at first in the Council of State until 1993 and after in the Court of Audit.

He was a member and president of a sector in the European Court of Audit from 2002 to 2013.

As vice president of the Court of Audit, he was the head of the third sector of the Court from 2014 to 2019.

He was granted honorable doctorates from the International University of Greece, the Panteion University, and the Aristotle University of Thessaloniki in the fields of public administration and law.^[4]