Legislative elections were held in South Korea on 26 November 1963.

[1] They were the first held after the 1961 coup and subsequent approval of a new constitution the previous December, which inaugurated the Third Republic.

The result was a victory for the Democratic Republican Party of coup leader Park Chung Hee, which won 110 of the 175 seats in the National Assembly.

The unicameral National Assembly was elected by parallel voting, with 131 legislators elected in single-member constituencies and 44 allocated via a modified formula on the national level, excluding parties that did not win more than three seats or more than 5% of the valid vote.

If the percentage of votes for the first-placed party was over 50%, the national seats would be allocated in proportion to vote share, with the first-placed party being limited to two-thirds of the available national seats (it would then be eliminated from further consideration for national seats).