Seongsu Station (Korean: 성수역) is a rapid transit station on Seoul Subway Line 2. It is located in Seongsu-dong in the Seongdong-gu administrative district of Seoul. It is also the southeastern terminus of Line 2's Seongsu Branch to Sinseol-dong. Trains needing to be serviced take the Seongsu Branch from this station and go to the Gunja Train Depot behind Yongdap Station.
The platform is elevated and features 4 tracks. The main circle route of Line 2 runs on the inside pair of tracks while the Sinseol-dong branch is served by the outside pair of tracks. The station has four exits and is connected to two bus routes as well as a local shuttle bus which services the various apartment complexes in the area around the station. The stations services Seongsu 1ga 1 dong, Seongsu 2ga 1 dong, and Seongsu 2ga 3 dong. The area around the station is primarily commercial and light industrial but gives way to mixed-use development and residential further from station. Exits 1 and 2 service a nearby Lotte Castle apartment complex.