is a railway station on the Senmà  Main Line in Koshimizu, Hokkaido, Japan, operated by the Hokkaido Railway Company (JR Hokkaido).
Hama-Koshimizu Station is served by the Senmà  Main Line between Higashi-Kushiro and Abashiri. It is numbered B74.
The station is unstaffed, and consists of two side platforms serving two tracks.
The station opened on 10 November 1925 as . It was renamed Hama-Koshimizu on 15 November 1952 due to its proximity to the beach at the town of Koshimizu.