Parliamentary elections were held in Greece on 20 November 1977.^[1] After Prime Minister Constantine Karamanlis called for early elections, his New Democracy party lost a large number of seats, yet still retain an absolute majority in the Parliament.^[2] 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.

Party		Votes	%	Seats	+/–
	New Democracy	2,146,365	41.84	171	−49
	PASOK	1,300,025	25.34	93	+81
	Union of the Democratic Centre	612,786	11.95	16	+16
	Communist Party of Greece	480,272	9.36	11	–
	National Alignment	349,988	6.82	5	New
	Progress and Left Forces Alliance	139,356	2.72	2	–
	Party of New Liberals	55,494	1.08	2	New
	Revolutionary Communist Movement	11,895	0.23	0	0
	Popular Democratic Unity	8,839	0.17	0	New
	International Workers' Union – Trotskyists	1,032	0.02	0	New
	Hellenic Christian-Social Union	777	0.02	0	New
	Communist Organisation "Fighter"	321	0.01	0	New
	Labour-Agricultural Party of Greece	170	0.00	0	New
	Farmer Smoke-Producers Party	84	0.00	0	New
	Olympic Democracy	19	0.00	0	New
	Independents	22,348	0.44	0	New
Total		5,129,771	100.00	300	0
Valid votes		5,129,771	98.77
Invalid/blank votes		64,120	1.23
Total votes		5,193,891	100.00
Registered voters/turnout		6,403,738	81.11
Source: Nohlen & Stöver

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.