| Teamname: | IBM Big Blue 日本IBMビッグブルー |
| Fullname: | IBM Big Blue |
| Nickname: | Big Blue, BBB |
| Founded: | 1976 |
| Countryflag: | Japan |
| Pattern B1: | _tealwavy |
| Leftarm1: | 000080 |
| Body1: | FFFFFF |
| Rightarm1: | 000080 |
| Shorts1: | 000080 |
| Socks1: | 000080 |
IBM Big Blue is a Japanese semi-professional rugby union team in the Top League. The team was founded in 1976 by IBM. The company decided to make rugby, along with baseball and American football, one of the official company sports in 1989, which allowed the rugby club to gain support and momentum.
Big Blue won promotion from the Japan East Ten league to the Top League at the end of the League's first season (2003-4) but was then automatically relegated by coming 12th in the second season (2004-5). The team returned to the Top League for the 2006-7 season. It is based in Chiba prefecture in the Kanto area.
The former head coach, Ippei Onishi, is a former captain of Kobe Kobelco Steelers. As of 2007–2008, the coach is Hiroki Ando. USA Eagle flyhalf Mike Hercus is a notable alumnus.