| Acorn Club |
| Akita Northern Bullets |
| Big Blues |
| Blue Arrows |
| Canon Eagles |
| Chubu Electric Power |
| Chugoku Red Regulions |
| Clean Fighters Yamanashi |
| Coca-Cola Red Sparks |
| EBR |
| Edoryu Wise Force |
| Fuji Xerox Fire Bird |
| Funaoka SDF Wild Boar's |
| Fukuoka Bank Blue Groupers |
| Hibiya Rugby Football Club |
| Hino Red Dolphins |
| Hitachi Sun Nexus |
| Hitachi Head Quaters |
| Hitachinaka Rugby Football Club |
| Honda Heat |
| Honda Rugby Football Club |
| Jal Wings |
| JR East Rugby |
| JR Kyushu Thunders |
| JR West Railers |
| Kamaishi Seawaves |
| Keio Hirayama Highlanders |
| Kintetsu Liners |
| KJM Reds |
| KKDI |
| Kobelco Steelers |
| Kubota Spears |
| Kurita Water Gush |
| Kyuden Voltex |
| Lion Fangs |
| Mazda Blue Zoomers |
| Meiji Yasuda Life Insurance |
| Mitsubishi Motors Mizushima |
| Mitsubishi Nagasaki Neptunus |
| Mitsubishi Red Evolutions |
| Mitsubishi Sagamihara Dynaboars |
| Mitsubishi Yokohama |
| MS Lager Clough |
| MSM Steelers |
| MUFG |
| Munakata Sanix Blues |
| NEC Green Rockets |
| Nippon Steel Sumitomo Metals Hachiman |
| Nissay Tokyo |
| NTT-Docomo Red Hurricanes |
| NTT Shining Arcs |
| Osaka Police |
| Panasonic Wild Knights |
| Red Canyons |
| Ricoh Black Rams |
| Ricoh Japan |
| RIEC Data |
| Secom Rugguts |
| Shimadzu Breakers |
| Shimizu Blue Sharks |
| Shokou Rugby Football Club |
| SK-Knights |
| Sumitomo Corporation |
| Suntory Foods Sundelphis |
| Suntory Sungoliath |
| Sunwolves |
| Tokio Marine & Nichido |
| Tokyo Fire Department |
| Tokyo Gas |
| Toshiba Brave Lupus |
| Toshiba Oita |
| Toyota Blue Wing |
| Toyota Industries Shuttles |
| Toyota Verblitz |
| Trymu RFC Breakers |
| Unisys Red Vipers |
| Unitika Phoenix |
| Yakult Levins |
| Yamaha Jubilo |
| Yaskawa |
| Yokogawa Musashino Atlastars |
