- February 5: The Mount Parnes Casino is opened for business.
- February 11: Evidence of petroleum appears off the coast of Thasos.
- February 21: Thomas Mavros of Panionios scores against Pierikos, at age 16 years, 8 months old, becoming the youngest Greek player to score in the Alpha Ethniki.
- March 9: Two Greek rivers, the Evros and the Pineios flood causing damages to the produce in their respective areas.
- March 9: En route to the 1971 European Cup Final, Panathinaikos draw away to Everton 1-1 in the quarterfinals. The scorer of PAO's goal is number 9 (Antonis Antoniadis) who scored his 9th goal in Europe, on the 9th of the month, 9 minutes before time, exactly at 9:00PM!
- March 24: Panathinaikos draw Everton 0-0 at home and advance into the semi-finals of the Cup of Champions on away goals.
- April 14: Panathinaikos are humbled 4-1 by Crvena Zvezda Belgrade, in the first leg of the semi-final of the European Champions' Cup.
- April 28: Panathinaikos overturn a 1-4 loss in Belgrade against Crvena Zvezda with a 3-0 victory in Athens. The result enables PAO to qualify for the final of the European Champions' Cup in Wembley.
- June 2: Panathinaikos play Ajax Amsterdam in the 1971 European Cup Final. Ajax win 2-0.
- June 13: Panagiotis Nacopoulos smashes Giorgos Papavassiliou's 11 year-old record in 3000m steeple (8:45.8) with 8:40.8
- June 18: Junta strongman George Papadopoulos threatens Cyprus President Archbishop Makarios III with "bitter measures" should he insist on refusing Papadopoulos' proposals relating to the Turkish Cypriot minority.
- October 15: Giorgos Georgiadis, breaks the Greek record in the hammer throw with 68.76m, winning the gold medal in the Mediterranean Games.
- October 26: Mitsos Partsalidis, Babis Drakopoulos and 30 other members of the KKE-Interior are arrested.
- December 11: It is announced that broadcast television will cover as of 1972 the entire Greek periphery.
- December 15: Panathinaikos, representing Europe, draw 1-1 against Nacional of Montevideo in the first leg of the Intercontinental Cup. The lone green goal was scored by Totis Fylakouris. Yiannis Tomaras is seriously injured with a broken leg.
- January 14: Antonios Nikopolidis, football player, goalkeeper of the Euro 2004 Greek team
- January 30: Giorgos S. Georgiadis, footballer
- October 13: Pyrros Dimas, weightlifter
- October 27: Theodoros Zagorakis, footballer, captain of the Euro 2004 Greek team