The members of the eleventh National Assembly of South Korea were elected on 25 March 1981. The Assembly sat from 11 April 1981 until 10 April 1985.[1]
| Date | Constituency | Incumbent | Party | New member | Party | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 4 November 1981 | Seo–Dong, Busan | Lee U-jae | Democratic Justice | Chung Chang-wha | Democratic Justice | Incumbent resigned on 4 November 1981 upon appointment as the head of the Korean Telecommunications Authority; replaced by the next member in the Democratic Justice list. | |||
| 12 December 1981 | Proportional representation | Kim Jong-gyeong | Democratic Justice | Mun Yong-ju | Democratic Justice | Incumbent died on 12 December 1981; replaced by the next member in the Democratic Justice list. | |||
| 6 January 1982 | Proportional representation | Rha Woong-bae | Democratic Justice | Kim Yu-sang | Democratic Justice | Incumbent resigned on 6 January 1982 upon appointment as Minister of Finance; replaced by the next member in the Democratic Justice list. | |||
| 30 July 1982 | Seosan–Dangjin, South Chungcheong Province | Han Young-soo | Democratic Korea | Seat remained vacant | Incumbent resigned on 30 July 1982. No by-election held. | ||||
| 4 September 1982 | Proportional representation | Jeong Hui-taek | Democratic Justice | Chang Kyung-woo | Democratic Justice | Incumbent resigned on 4 September 1982 upon appointment as the director of the Board of Audit and Inspection; replaced by the next member in the Democratic Justice list. | |||
| 12 November 1982 | Proportional representation | Kim Haeng-ja | Democratic Justice | Ryu Su-hwan | Democratic Justice | Incumbent died on 12 November 1982; replaced by the next member in the Democratic Justice list. | |||
| 20 December 1982 | Proportional representation | Chung Soon-duk | Democratic Justice | Kim Ji-ho | Democratic Justice | Incumbent resigned on 20 December 1982 upon appointment as Senior Presidential Secretary for Political Affairs; replaced by the next member in the Democratic Justice list. | |||
| 14 July 1983 | Proportional representation | Lee Heon-gi | Democratic Justice | Kang Chang-hee | Democratic Justice | Incumbent resigned on 14 July 1983 upon appointment as Vice Minister of Health and Social Affairs; replaced by the next member in the Democratic Justice list. | |||
| 9 October 1983 | Dong–Buk, Gwangju, South Jeolla Province | Sim Sang-u | Democratic Justice | Seat remained vacant | Incumbent died in the Rangoon bombing on 9 October 1983. No by-election held. | ||||
| 15 March 1984 | Proportional representation | Yu Ok-u | Democratic Korea | Lee Yong-gon | Democratic Korea | Incumbent died on 15 March 1984; replaced by the next member in the Democratic Korea list. | |||
| 30 April 1984 | Proportional representation | Song Ji-yeong | Democratic Justice | Lee Seong-bae | Democratic Justice | Incumbent resigned on 30 April 1984 upon appointment as the president of the Korean Broadcasting System; replaced by the next member in the Democratic Justice list. | |||
| 29 June 1984 | Damyang–Gokseong–Hwasun, South Jeolla Province | Jeong Rae-hyeok | Democratic Justice | Seat remained vacant | Incumbent resigned on 29 June 1984. No by-election held. | ||||
| 26 December 1984 | Proportional representation | O Je-do | Democratic Justice | Seat remained vacant | Incumbent resigned on 26 December 1984. | ||||
| 29 December 1984 | Cheongju–Cheongwon, North Chungcheong Province | Yun Seok-min | Korean National | Seat remained vacant | Incumbent resigned on 29 December 1984. No by-election held. | ||||