Legislative elections were held in South Korea on 12 December 1978 to elect 154 members of the National Assembly.^[1] Another 77 members appointed by President Park Chung-hee were indirectly elected by the National Conference for Unification on 21 December 1978.^[2]

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1978 South Korean legislative election

← 1973 12 and 21 December 1978 1981 →
154 of the 231 seats in the National Assembly 78 seats needed for a majority
Turnout	77.08% ( 5.72pp)
Party Leader % Seats +/– New Democratic Yi Cheol-seung 32.82 61 +9 Democratic Republican Park Chung-hee 31.70 68 −5 Democratic Unification Yang il-dong 7.39 3 +1 Independents – 28.09 22 +3 This lists parties that won seats. See the complete results below. Results by constituency Speaker before Speaker after Chung Il-kwon Democratic Republican Baek Du-jin Presidential appointee

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Despite garnering 169,000 fewer popular votes than the opposition New Democratic Party, the ruling Democratic Republican Party won a supermajority victory with 68 of the 154 elected seats in the National Assembly and an additional 77 members appointed by President Park. Voter turnout was 77.1%.

Of the elected seats, two members were elected from each constituency via single non-transferable vote.