The members of the thirteenth National Assembly of South Korea were elected on 26 April 1988. The Assembly sat from 30 May 1988 until 29 May 1992.[1]
| Date | Constituency | Incumbent | Party | New member | Party | Notes | ||
|---|---|---|---|---|---|---|---|---|
| 19 December 1988 | Proportional representation | Kang Young-hoon | Democratic Justice | Shim Ki-seop | Democratic Justice | Incumbent resigned on 19 December 1988 upon appointment as the Prime Minister of South Korea; replaced by the next member in the Democratic Justice list. | ||
| Proportional representation | Choi Chang-yun | Democratic Justice | An Chan-hui | Democratic Justice | Incumbent resigned on 19 December 1988 upon appointment as Senior Presidential Secretary for Political Affairs; replaced by the next member in the Democratic Justice list. | |||
| 14 April 1989 | Donghae, Gangwon Province | Hong Hee-pyo | Independent | Hong Hee-pyo | Independent | Incumbent's election invalidated on 14 March 1989; re-elected in the by-election. | ||
| 18 August 1989 | Yeongdeungpo B, Seoul | Kim Myung-sup | Democratic Justice | Rha Woong-bae | Democratic Justice | Incumbent's election invalidated on 26 May 1989. New member by-elected. | ||
| 21 March 1990 | Proportional representation | Lee Hui-il | Democratic Liberal (elected as New Democratic Republican) | Kwon O-seok | Democratic Liberal (from New Democratic Republican list) | Incumbent resigned on 21 March 1990 upon appointment as Minister of Energy; replaced by the next member in the former New Democratic Republican list. | ||
| 3 April 1990 | Seo A, Daegu | Chung Ho-yong | Democratic Justice | Moon Hi-gab | Democratic Liberal | Incumbent resigned on 5 January 1990. New member by-elected. | ||
| Jincheon–Eumseong, North Chungcheong Province | Kim Wan-tae | Democratic Justice | Heo Tak | Independent | Incumbent died on 13 January 1990. New member by-elected. | |||
| 9 November 1990 | Hampyeong–Yeonggwang, South Jeolla Province | Suh Kyong-won | Independent (elected as Peace Democratic) | Lee Soo-in | Peace Democratic Party | Incumbent removed on 24 August 1990 for making a secret visit to North Korea. New member by-elected. | ||
| 28 December 1990 | Proportional representation | Son Ju-hwan | Democratic Liberal (elected as Democratic Justice) | Choi Sang-jin | Democratic Liberal (from Democratic Justice list) | Incumbent resigned on 28 December 1990 upon appointment as Senior Presidential Secretary for Political Affairs; replaced by the next member in the former Democratic Justice list. | ||
| 19 August 1991 | Gochang, South Gyeongsang Province | Kim Dong-yeong | Democratic Liberal (elected as Reunification Democratic) | Seat remained vacant | Incumbent died on 19 August 1991. No by-election held. | |||
| 26 February 1992 | Yangsan, South Gyeongsang Province | Kim Dong-ju | Independent (elected as Reunification Democratic) | Seat remained vacant | Incumbent resigned on 26 February 1992. No by-election held. | |||
| 28 February 1992 | Gangseo A, Seoul | Lee Won-bea | Independent (elected as Peace Democratic) | Seat remained vacant | Incumbent removed on 28 February 1992. No by-election held. | |||
| Gangnam B, Seoul | Lee Tae-sup | bgcolor= | Democratic Liberal (elected as Democratic Justice) | Seat remained vacant | Incumbent removed on 28 February 1992. No by-election held. | |||
| Cheongju B, North Chungcheong Province | Oh Yong-woon | Democratic Liberal (elected as New Democratic Republican) | Seat remained vacant | Incumbent removed on 28 February 1992. No by-election held. | ||||
| 10 March 1992 | Jinhae–Uichang, South Gyeongsang Province | Park Jae-gyu | Democratic Liberal (elected as Reunification Democratic) | Seat remained vacant | Incumbent removed on 10 March 1992. No by-election held. | |||
| Gimhae City–Gimhae County, South Gyeongsang Province | Lee Hak-bong | Independent (elected as Democratic Justice) | Seat remained vacant | Incumbent removed on 10 March 1992. No by-election held. | ||||