Konstantinos Tsatsos, Greek scholar and politician, President of Greece (died 1987)

Konstantinos D. Tsatsos was a Greek diplomat, professor of law, scholar and politician. He served as the second President of the Third Hellenic Republic from 1975 to 1980.

The president of Greece, officially the president of the Hellenic Republic, commonly referred to in Greek as the president of the Republic, is the head of state of Greece. The president is elected by the Hellenic Parliament; the role has been mainly ceremonial since the 1986 constitutional reform. The office was formally established by the Constitution of Greece in 1975, but has antecedents in the Second Hellenic Republic of 1924–1935 and the Greek junta in 1973–1974 which predated the transition to the current Third Hellenic Republic.