2014 South Korean by-elections

The following Members of National Assembly lost their seat:

• Seoul Dongjak 2nd District: Chung Mong-joon (Saenuri), due to his candidacy for the Metropolitan Mayor of Seoul.
• Busan Haeundae-Gijang 1st District: Suh Byung-soo (Saenuri), due to his candidacy for the Metropolitan Mayor of Busan.
• Gwangju Gwangsan 2nd District: Lee Yong-sup (Independent), due to his candidacy for the Metropolitan Mayor of Gwangju.
• Daejeon Daedeok: Park Seoung-hyo (Saenuri), due to his candidacy for the Metropolitan Mayor of Daejeon.
• Ulsan Nam 2nd District: Kim Gi-hyeon (Saenuri), due to his candidacy for the Metropolitan Mayor of Ulsan.
• Gyeonggi Suwon 2nd District: Shin Jang-yong (NPAD), due to his violation of the Public Official Election Act.
• Gyeonggi Suwon 3rd District: Nam Kyung-pil (Saenuri), due to his candidacy for the Governor of Gyeonggi.
• Gyeonggi Suwon 4th District: Kim Jin-pyo, due to his candidacy for the Governor of Gyeonggi.
• Gyeonggi Pyeongtaek 2nd District: Lee Jae-young (Saenuri), due to his violation of the Public Official Election Act and embezzlement.
• Gyeonggi Gimpo: Yoo Jeong-bok (Saenuri), due to his candidacy for the Metropolitan Mayor of Incheon.
• North Chungcheong Chungju: Yoon Jin-sik (Saenuri), due to his candidacy for the Governor of North Chungcheong.
• South Chungcheong Seosan-Taean: Sung Wan-jong (Saenuri), due to his violation of the Public Official Election Act.
• South Jeolla Suncheon-Gokseong: Kim Sun-dong (UPP), due to his violation of the Firearms, Knives and Explosives Regulation Act.
• South Jeolla Naju-Hwasun: Bae Ki-woon (NPAD), due to his violation of the Public Official Election Act.
• South Jeolla Damyang–Hampyeong–Yeonggwang–Jangseong: Lee Nak-yon (NPAD), due to his candidacy for the Governor of South Jeolla.

The ruling conservative Saenuri Party gained 11 seats and retained their majority in the National Assembly.^[1] The liberal party NPAD conceded defeat. Later, the NPAD split into two political parties: the Democratic Party of Korea, led by Moon Jae-in, and the People's Party, led by Ahn Cheol-soo. A leading issue during these elections was the Sewol ferry disaster.^[2]