| Sejong B | |
|---|---|
| Single-member constituency for the National Assembly | |
 Location of the constituency | |
| District(s) | Sejong City (part) |
| Region | Sejong City |
| Electorate | 129,759 (2024) |
| Current constituency | |
| Created | 2020 |
| Seats | 1 |
| Party | Democratic Party |
| Member(s) | Kang Jun-hyeon |
| Created from | Sejong |
Sejong B (Korean: 세종특별자치시 을) is a constituency of the National Assembly of South Korea. The constituency consists of Sejong City excluding the southern portion. As of 2024, 129,759 eligible voters were registered in the constituency.