| Country: | Greece |
| Type: | parliamentary |
| Previous Election: | 1974 Greek legislative election |
| Previous Year: | 1974 |
| Next Election: | 1981 Greek legislative election |
| Next Year: | 1981 |
| Seats For Election: | All 300 seats in the Hellenic Parliament |
| Majority Seats: | 151 |
| Election Date: | 20 November 1977 |
| Image1: | KaramanlisNatsinasAgora crop.jpg |
| Leader1: | Constantine Karamanlis |
| Party1: | New Democracy (Greece) |
| Seats1: | 171 |
| Seat Change1: | 49 |
| Popular Vote1: | 2,146,365 |
| Percentage1: | 41.84% |
| Swing1: | 12.53pp |
| Leader2: | Andreas Papandreou |
| Party2: | PASOK |
| Last Election2: | 13.58%, 12 seats, |
| Seats2: | 93 |
| Seat Change2: | 81 |
| Popular Vote2: | 1,300,025 |
| Percentage2: | 25.34% |
| Swing2: | 11.76pp |
| Image3: | GEORGIOS MAVROS.jpg |
| Leader3: | Georgios Mavros |
| Party3: | EDIK |
| Last Election3: | 20.42%, 60 seats |
| Seats3: | 16 |
| Seat Change3: | 44 |
| Popular Vote3: | 612,782 |
| Percentage3: | 11.95% |
| Swing3: | 8.47pp |
| Image4: | Charilaos_Florakis.JPG |
| Leader4: | Charilaos Florakis |
| Party4: | Communist Party of Greece |
| Last Election4: | 9.47%, 8 seats |
| Seats4: | 11 |
| Seat Change4: | 3 |
| Popular Vote4: | 480,272 |
| Percentage4: | 9.36% |
| Swing4: | 0.11pp |
| Image5: | Stefanos Stefanopoulos 1965.jpg |
| Leader5: | Stefanos Stefanopoulos |
| Party5: | National Alignment |
| Last Election5: | – |
| Seats5: | 5 |
| Seat Change5: | New |
| Popular Vote5: | 349,988 |
| Percentage5: | 6.82% |
| Swing5: | New |
| Color5: | 0a00cc |
| Leader6: | Ilias Iliou |
| Party6: | SPAD |
| Seats6: | 2 |
| Popular Vote6: | 139,356 |
| Percentage6: | 2.72% |
| Color6: | ffb6c1 |
| Image7: | Mitsotakis 1992.jpg |
| Leader7: | Constantine Mitsotakis |
| Party7: | Party of New Liberals |
| Last Election7: | – |
| Seats7: | 2 |
| Seat Change7: | New |
| Popular Vote7: | 55,494 |
| Percentage7: | 1.08% |
| Swing7: | New |
| Color7: | 87ceeb |
| Prime Minister | |
| Posttitle: | Prime Minister after election |
| Before Election: | Constantine Karamanlis |
| Before Party: | New Democracy (Greece) |
| After Election: | Constantine Karamanlis |
| After Party: | New Democracy (Greece) |
Parliamentary elections were held in Greece on 20 November 1977.[1] After Prime Minister Constantine Karamanlis called for early elections, his New Democracy party suffered a significant loss of power. However, Karamanlis managed to secure an absolute majority in the Parliament. The big surprise was the success of PASOK, whose socialistic rhetoric remained radical. Because of PASOK's success, the Centrists (Union of the Democratic Centre, EDIK, former Center Union - New Forces) led again by Georgios Mavros) lost half of their power. As a result, Andreas Papandreou, PASOK's leader, became a prominent figure in Greek politics. The Communists (Communist Party of Greece) and the Nationalists managed to amplify their support.
Future Prime Minister of Greece, Antonis Samaras first won a seat in parliament at this election.
In 1979 Greece became European Community's 10th member, despite the opposition of PASOK and the Communists. In October 1980 Greece rejoined NATO military structure. In 1980, Constantine Karamanlis succeeded Constantine Tsatsos as President of the Republic. George Rallis became Prime Minister and new leader of ND.