is a railway station on the Rinkai Line in Shinagawa, Tokyo, Japan, operated by the third-sector railway operating company Tokyo Waterfront Area Rapid Transit (TWR).
Shinagawa Seaside Station is served by the Tokyo Waterfront Area Rapid Transit Rinkai Line between and , with many through trains continuing to and from the East Japan Railway Company (JR East) Saikyà  Line and Kawagoe Line.
The underground station concourse is located on the basement ("1BF") level, and the single island platform is located on the third-basement ("3BF") level, serving two tracks. There are three entrances to the station: "A" at the north end, and "B" and "C" at the south end.
The station opened on 1 December 2002.
Station numbering was introduced in 2016 with Shinagawa Seaside being assigned station number R06.
Platform screen doors became operational on the platforms in early 2022.
In fiscal 2011, the station was used by an average of 20,917 passengers daily.