Seo–Dong, Busan (Korean: 부산광역시 서구·동구) is a constituency of the National Assembly of South Korea.

The constituency consists of Busan's Seo District and Dong District.

As of 2024, 172,850 eligible voters were registered in the constituency.

Like the vast majority of constituencies located in Busan, Seo–Dong is considered a safe seat for the conservative People Power Party and its predecessor parties.

[1] The constituency encompasses all neighborhoods within the Seo and Dong Districts of Busan.