The New Democratic Party of Korea (Korean: 신민당 hanja: 新民黨; NDP) was a South Korean party that existed from 1963 to 1980 when it was forcibly dissolved by the ninth amendment of the constitution promulgated by Chun Doo-hwan the same year. It was the main opposition party during the Park Chung-hee dictatorial regime and especially since 1972 when the Yushin constitution was put into effect.