Kamaishi Seawaves is a Rugby union football club in Kamaishi, Iwate Prefecture, Japan.

It was established in 2001.

[1] At its inception, it was known as Nippon Steel Corporation Kamaishi.

[2] The Kamaishi Seawaves squad for the 2024-25 season is:[3] Props Hookers Locks Flankers No8s Scrum-halves Fly-halves Centres Wingers Fullbacks Utility Backs The following former Kamaishi Seawaves players became Japanese internationals:[4]