Mitsubishi Dynaboars ( 三菱重工相模原ダイナボアーズ?) also known as Mitsubishi Juko Sagamihara Rugby Club, are a Japanese rugby union team based in Sagamihara, Kanagawa Prefecture, Japan. The owner of this club is Mitsubishi Heavy Industries.
The club was founded in 1981. It came second in the Top East 10 league in 2004-5 and entered the Top League challenge series play-off.
The club won the Top East 11 league in 2006-2007 and entered the Top League in 2007-2008. The team was named Dynaboars (a conflation of "dynamic" and "boars") as part of their promotion to the Top League; however, they were demoted at the end of the season. The dynaboars have recently signed ex Wales international and leading top try scorer ever for the national side Shane Williams, who is also an ex world player of the year from 2008. Williams scored a try in his debut game.