| Dongdaemun B | |
|---|---|
| Single-member constituency for the National Assembly | |
 Location of the constituency | |
| District(s) | Dongdaemun District (part) |
| Region | Seoul |
| Electorate | 148,013 (2016) |
| Current constituency | |
| Created | 1988 |
| Seats | 1 |
| Party | Democratic Party |
| Member | Jang Kyung-tae |
| Council constituency | Dongdaemun 3rd district Dongdaemun 4th district |
| Created from | Dongdaemun |
Dongdaemun B (Korean: 동대문구 을) is a constituency of the National Assembly of South Korea. The constituency consists of part of Dongdaemun District, Seoul. As of 2016, 148,013 eligible voters were registered in the constituency.