- January 3: During the Greek Civil War, The battle for Konitsa ends in a decisive victory for the National Forces.
- January 9: The Hellenic Parliament passes Law 518 annexing the Dodecanese islands.
- February 9: A major earthquake (7.1 on the Richter scale) strikes the island of Karpathos.
- February 18: The CISM is founded by member states Belgium, Holland, Luxembourg, Denmark and France in Nice, France. Greece will become member on March 8, 1950.
- February 24: American General James Van Fleet arrives in Greece to assist the national forces against the Democratic Army of Greece in the Greek Civil War.
- March 2: The National Forces launch "Operation Pergamos" to drive the Democratic Army of Greece from the Mourgana mountains.
- March 3: Manolis Glezos goes on trial for his political convictions.
- March 7: The Dodecanese officially become part of Greece.
- March 28: The National Forces make a second unsuccessful attempt to dislodge the Democratic Army of Greece from the Mourgana mountains.
- April 15: The Greek A Army Corps, under Gen Thrasyvoulos Tsakalotos, conducts a mop-up operation, throughout Central Greece, against the Democratic Army of Greece, during the Greek Civil War. This operation was codenamed "Dawn".
- April 22: A strong earthquake (6.5 on the Richter scale) destroys much of Lefkada.
- April 23: Greece play their first post-WW II football game and lose 1-3 to Turkey at Leoforos Alexandras Stadium.
- May 1: Justice Minister, Christos Ladas, is assassinated during the Greek Civil War.
- May 8: American journalist, George Polk, is murdered in Thessaloniki.
- May 16: The body of American journalist, George Polk, who had been missing for days, is found by fisherman, Lambros Antonaros, floating in the Thermaic Gulf.
- June 14: Operation Coronis is put into effect during the Greek Civil War by the national forces. Its aim is to drive out the Communists from the northern Pindus mountains.
- June 17: Assassin Efthymios Moutsoyiannis and eight accomplices go on trial for the murder of Justice Minister Christos Ladas.
- June 21: All nine men accused of murdering Justice Minister, Christos Ladas, are found guilty and sentenced to death.
- June 25: Six of the men accused of having a part in the murder of Justice Minister, Christos Ladas, are executed by firing squad.
- June 30: A strong earthquake (6.4 on the Richter scale) strikes Lefkada adding to the destruction of another earthquake on April 22 of the same year.
- July 3: The Corinth Canal, which was rendered useless by the retreating Germans, is put into operation again.
- August 20: Democratic Army of Greece commander, Giorgos Yiannoulis, is executed during the Greek Civil War.
- August 21: The national forces abandon "Operation Coronis" in the Greek Civil War.
- September 3: Marshall Tito shuts down the training camps of the Democratic Army of Greece in Yugoslavia.
- September 11: The National Forces launch "Operation Taurus" as they attack the Democratic Army of Greece at their stronghold in the Mourgana mountains.
- September 18: The National Forces drive the Democratic Army of Greece out of the Mourgana mountains.
- October 31: The last entry in Greek armored cruiser Georgios Averof's log reads: «Συνήθης εν όρμω υπηρεσία. Κινήσεις συμφώνως τω πίνακι. Εκτακτον ουδέν»
- November 1: Archbishop Athenagoras is elected Ecumenical Patriarch.
- November 17: The UN General Assembly passes resolution 193, condemning the removal of Greek children to Eastern Bloc countries and demanding their return.
- December 12: The Democratic Army of Greece attacks and enters Karditsa.
- December 13: National Forces drive out the Democratic Army of Greece from Karditsa.
- December 23: The Democratic Army of Greece is repelled at Edessa.
- December 30: The Democratic Army of Greece is repelled at Aridaia.
- December 7: Lakis Papadopoulos (Λάκης με τα ψηλά ρεβέρ), musician, songwriter
- December 10: Dusan Bajevic, football player and coach
- December 11: Stamatis Spanoudakis, music composer