| Sejong | |
| Type: | Single-member |
| Constituency Link: | Sejong (constituency) |
| Parl Name: | National Assembly |
| District Label: | District(s) |
| District: | Sejong City (citywide) |
| Region Label: | Region |
| Region: | Sejong City |
| Electorate: | 167,748 |
| Year: | 2012 |
| Abolished: | 2020 |
| Members Label: | Member |
| Members: | Lee Hae-chan |
| Seats: | 1 |
| Elects Howmany: | 1 |
| Party Label: | Party |
| Party: | Democratic Party |
| Local Council Label: | Council constituency |
| Local Council: | Sejong 1st–16th district |
| Next: | Sejong A, Sejong B |
| Previous: | Gongju–Yeongi |
Sejong (Korean: 세종특별자치시) was a constituency of the National Assembly of South Korea that existed from 2012 to 2020. The constituency consisted of Sejong City (citywide). As of 2016, 167,748 eligible voters were registered in the constituency. Ahead of the 2020 South Korean legislative election, it was separated into Sejong City A and Sejong B.
| Election | Member | Party | Dates | Notes | ||
|---|---|---|---|---|---|---|
| bgcolor= | 2012 | Lee Hae-chan[1] | Democratic United | 2012–2020 | Minister of Education (1998–1999); Prime Minister of South Korea (2004–2006); Chairman of the Democratic United Party (2012); Leader of the Democratic Party (2018–2020) | |
| bgcolor= | 2016 | Independent | ||||
| 2020 | constituency abolished | |||||