Seongsu-dong (Korean: 성수동) is a dong, or neighbourhood, of Seongdong-gu in Seoul, South Korea. It is further subdivided into Seongsu-dong 1-ga and Seongsu-dong 2-ga, and is served by Ttukseom Station and Seongsu Station on Seoul Subway Line 2 and by Seoul Forest Station on the Suin-Bundang Line. Its most notable attraction is Seoul Forest, a public park. The neighborhood has become popular in recent years for its array of cafes and restaurants, many of which have been set up in repurposed factories and old residential buildings, earning it the nickname "The Brooklyn of Seoul". There are also various stores built inside repurposed shipping containers.

Seongdong District (Seongdong-gu) is one of the 25 gu which make up the city of Seoul, South Korea. It is situated on the north bank of the Han River. It is divided into 20 dong (neighbourhoods).