Shimizu Koto Blue Sharks – nicknamed the Blue Sharks – are a Japanese rugby union team, currently playing in the Japan Rugby League One.

When rugby union in Japan was restructured in 2003 with the introduction of the Top League, Shimizu Blue Sharks was allocated to the second tier Top East League.

They were relegated after the 2007–08 season, and played in lower leagues for a decade.

They won promotion back for the 2017–18 season, where they secured a fourth-place finish.

[2] The Shimizu Koto Blue Sharks squad for the 2024-25 season is:[3] Props Hookers Locks Flankers No8s Scrum-halves Fly-halves Centres Wingers Fullbacks Utility Backs