DateRThuis v Uit-
03/02 03:00 8 Kintetsu Liners v Toshiba Brave Lupus 32-50
03/01 10:00 8 Honda Heat v Canon Eagles 21-50
02/25 04:00 7 Black Rams v Kobelco Steelers 17-27
02/24 05:30 7 Kintetsu Liners v Kubota Spears 19-56
02/24 05:05 7 Toshiba Brave Lupus v Canon Eagles 27-7
02/24 05:00 7 Mitsubishi Dynaboars v Shizuoka Blue Revs 53-45
02/17 05:30 - Urayasu D-Rocks v Kamaishi Seawaves RFC 85-5
02/17 05:30 7 Wild Knights v Suntory Sungoliath 24-20
02/17 05:00 7 Toyota Verblitz v Honda Heat 54-7
02/10 05:30 - Red Hurricanes v Toyota Industries 15-24
02/04 04:30 - Green Rockets v Kamaishi Seawaves RFC 61-17
02/03 03:00 - Urayasu D-Rocks v Red Hurricanes 45-15
01/28 05:30 - Toyota Industries v Kyuden Voltex 52-19
01/27 05:30 6 Toyota Verblitz v Toshiba Brave Lupus 12-28
01/27 05:10 6 Canon Eagles v Kobelco Steelers 27-31
01/27 04:00 6 Shizuoka Blue Revs v Kintetsu Liners 50-12
01/27 04:00 6 Black Rams v Kubota Spears 17-18
01/20 05:30 6 Wild Knights v Honda Heat 70-12
01/20 05:00 6 Mitsubishi Dynaboars v Suntory Sungoliath 34-36
01/14 05:35 5 Toshiba Brave Lupus v Honda Heat 40-12
01/14 05:30 5 Kobelco Steelers v Kubota Spears 34-38
01/14 05:30 5 Kintetsu Liners v Toyota Verblitz 14-47
01/13 05:30 - Urayasu D-Rocks v Toyota Industries 10-7
01/13 05:10 5 Canon Eagles v Black Rams 24-8
01/13 05:00 5 Shizuoka Blue Revs v Suntory Sungoliath 25-29
01/13 03:00 - Red Hurricanes v Green Rockets 13-48
01/13 03:00 5 Mitsubishi Dynaboars v Wild Knights 21-81
01/07 05:30 4 Toshiba Brave Lupus v Kubota Spears 24-20
01/07 05:10 4 Mitsubishi Dynaboars v Canon Eagles 35-40
01/07 03:00 4 Honda Heat v Shizuoka Blue Revs 13-62

Japan Rugby League One (formerly the Top League) is a rugby union competition in Japan. It is the highest level of professional rugby competition in the country. The Japan Rugby Football Union created the competition in 2003, by absorbing the Japan Company Rugby Football Championship, to drive up the overall standard and popularity of the sport and improve the results of the Japan national rugby union team. The chief architect of the league was Hiroaki Shukuzawa who strongly felt the urgency of improving Japanese domestic company rugby to a professional level which would allow Japan to compete more convincingly at Rugby World Cups.

Until 2022, it was an industrial league, where many players were employees of their company and the teams were all owned by major companies. While the competition was known for paying high salaries, only world-class foreign players and a small number of Japanese players played fully professionally, which meant most of the players still played in an amateur capacity. The delayed 2021 season was the final season of the Top League, with the JRFU adopting a new fully-professional three-tier system from 2022. More details about the new structure was announced to the media in January 2021. Featuring 25 teams, the 12 top-tier clubs would be split into two conferences, with seven teams competing in division two and six in division three. The new competition was formally announced as Japan Rugby League One in July 2021.

The first season in 2003–04 featured 12 teams. The league was expanded to 14 teams in 2006–07 and 16 teams in 2013–14. The Top League is played during the off-season of the Super Rugby, Therefore, many full-time foreign professionals from Southern Hemisphere countries have played in the Top League, notably Tony Brown, George Gregan and Dan Carter. In the 2010s, salaries in the Top League have risen to become some of the highest in the rugby world; in 2012, South Africa's Jaque Fourie, now with Kobelco Steelers, was widely reported to be the world's highest-paid player.

Japan - Rugby League One is een professionele rugbycompetitie in Japan. Het is de hoogste divisie van rugby union in het land en omvat 12 teams. De competitie werd opgericht in 2022 en verving de Top League.

De Japan - Rugby League One bestaat uit twee afdelingen: de Top League en de Challenge League. De Top League bestaat uit de beste acht teams in het land, terwijl de Challenge League bestaat uit de resterende vier teams. De teams spelen een volledig seizoen met thuis- en uitwedstrijden. De beste teams van de Top League kwalificeren zich voor de play-offs, waar ze strijden om de titel van kampioen van Japan.

De Japan - Rugby League One is een van de meest prestigieuze rugbycompetities in Azië. Het trekt enkele van de beste spelers ter wereld aan en biedt een hoog niveau van rugby. De competitie is ook belangrijk voor de ontwikkeling van het rugby in Japan en helpt het land zich voor te bereiden op de Rugby World Cup van 2023.