The 2025 South Korean by-elections were held in 2025. According to the Public Official Election Act of South Korea, the first half by-elections were held on April 2, 2025.
The April 2, 2025 by-elections were held for vacancies in heads of local governments, local councilors, and superintendents of education that occurred from March 1, 2024 to February 28, 2025. Suffrage was granted to South Korean citizens residing in the election areas born by April 3, 2007, and to foreigners who have obtained permanent residency under Article 10 of the Immigration Act and resided for more than three years.
As a result of the vote counting, pan-progressive opposition parties including the Democratic Party of Korea achieved a landslide victory, winning the Guro District Mayor (Democratic Party of Korea), Asan Mayor (Democratic Party of Korea), Damyang County Commissioner (Korea Innovation Party), Geoje Mayor (Democratic Party of Korea), and Busan Superintendent of Education (Progressive). The pan-conservative bloc including the People Power Party suffered a crushing defeat, only retaining the Gimcheon Mayor (People Power Party).
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