The Japan Company Rugby Football Championship (全国社会人ラグビーフットボール大会 Zenkoku Shakaijin Ragubi- Futtobo-ru Taikai) is a former Japanese rugby union competition that ran from 1948 to 2003. Teams from companies or the public service played in the competition that extended from December to January in every season. The first championship was played in 1948-49 season and won by Haitan Koudan which beat Kintetsu (now Kintetsu Liners). After 55 years, the Championship was absorbed by the Top League for the 2003–04 season. This had been a significant competition for the development of Japanese company rugby.
| width=5% | Title | width=5% | Season | width=15% | Winner | width=10% | Score | width=15% | Runner-up | width=40% | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1948 | Haitan Koudan | 57–3 | Kintetsu | 3 teams participated. Tohoku Hiryou withdrew. | ||||||
| 2 | 1949 | Mitsui Chemical | 39–0 | Sumitomo Ponbetsu | 7 teams participated. Sendai Railway Admn withdrew. | ||||||
| 3 | 1950 | Yawata Steel | 32–0 | Toyota Motors | |||||||
| 4 | 1951 | Yawata Steel | 11–3 | Kintetsu | 8 teams participated. | ||||||
| 5 | 1952 | Yawata Steel | 15–6 | Kawasaki Heavy Ind. | 7 teams participated, Sumitomo Ponbetsu withdrew. | ||||||
| 6 | 1953 | Kyuden | 3–3 | - | Both teams obtained championship. 8 teams participated till 1955. | ||||||
| Kintetsu | |||||||||||
| 7 | 1954 | Yawata Steel | 19–0 | Daiei | |||||||
| 8 | 1955 | Yawata Steel | 24–5 | Kintetsu | |||||||
| 9 | 1956 | Kintetsu | 11–0 | Kyuden | 16 teams participated till 2002. Kintetsu shut down all 4 matches. | ||||||
| 10 | 1957 | Kintetsu | 12–3 | Kyoto City Hall | |||||||
| 11 | 1958 | Yawata Steel | 9–0 | Kintetsu | |||||||
| 12 | 1959 | Yawata Steel | 13–8 | Kintetsu | |||||||
| 13 | 1960 | Yawata Steel | 3–0 | Kintetsu | Yawata won the first NHK Cup. | ||||||
| 14 | 1961 | Kintetsu | 6–5 | Yawata Steel | |||||||
| 15 | 1962 | Yawata Steel | 19–3 | Tanifuji Machinery | |||||||
| 16 | 1963 | Yawata Steel | 16–3 | Kintetsu | Yawata and Kintetsu participated in the first Japan Championship. | ||||||
| 17 | 1964 | Yawata Steel | 25–3 | Toyota Motors | |||||||
| 18 | 1965 | Yawata Steel | 8–3 | Kintetsu | |||||||
| 19 | 1966 | Kintetsu | 15–3 | Toyota Motors | |||||||
| 20 | 1967 | Kintetsu | 6–5 | Toyota Motors | |||||||
| 21 | 1968 | Toyota Motors | 19–13 | Yawata Steel | |||||||
| 22 | 1969 | Kintetsu | 17–8 | Toyota Motors | Kintetsu and Toyota declined Japan Championship. Fuji Steel Kamaishi participated instead. | ||||||
| 23 | 1970 | Nippon Steel Kamaishi | 6–6 | - | Both teams obtained championship. | ||||||
| Ricoh | |||||||||||
| 24 | 1971 | Mitsubishi Motors Kyoto | 22–11 | Ricoh | |||||||
| 25 | 1972 | Ricoh | 29–3 | Mitsubishi Motors Kyoto | |||||||
| 26 | 1973 | Ricoh | 4–3 | Kintetsu | |||||||
| 27 | 1974 | Kintetsu | 10–7 | Ricoh | |||||||
| 28 | 1975 | Mitsubishi Motors Kyoto | 17–10 | Tokyo Sanyo | |||||||
| 29 | 1976 | Nippon Steel Kamaishi | 27–3 | Toyota Motors | |||||||
| 30 | 1977 | Toyota Motors | 19–15 | Tokyo Sanyo | |||||||
| 31 | 1978 | Nippon Steel Kamaishi | 15–3 | Mitsubishi Motors Kyoto | |||||||
| 32 | 1979 | Nippon Steel Kamaishi | 27–13 | Tokyo Sanyo | |||||||
| 33 | 1980 | Nippon Steel Kamaishi | 31–15 | Tokyo Sanyo | |||||||
| 34 | 1981 | Nippon Steel Kamaishi | 19–0 | Toyota Motors | |||||||
| 35 | 1982 | Nippon Steel Kamaishi | 16–0 | Toyota Motors | |||||||
| 36 | 1983 | Nippon Steel Kamaishi | 31–0 | Toshiba Fuchu | |||||||
| 37 | 1984 | Nippon Steel Kamaishi | 22–0 | Kobe Steel | |||||||
| 38 | 1985 | Toyota Motors | 19–7 | Kobe Steel | |||||||
| 39 | 1986 | Toyota Motors | 19–6 | Nippon Steel Kamaishi | |||||||
| 40 | 1987 | Toshiba Fuchu | 13–6 | Toyota Motors | |||||||
| 41 | 1988 | Kobe Steel | 23–9 | Toshiba Fuchu | |||||||
| 42 | 1989 | Kobe Steel | 28–15 | Suntory | |||||||
| 43 | 1990 | Kobe Steel | 18–16 | Sanyo Electric | |||||||
| 44 | 1991 | Kobe Steel | 24–15 | Sanyo Electric | |||||||
| 45 | 1992 | Kobe Steel | 20–19 | Toshiba Fuchu | |||||||
| 46 | 1993 | Kobe Steel | 18–3 | Sanyo Electric | |||||||
| 47 | 1994 | Kobe Steel | 37–14 | Toshiba Fuchu | |||||||
| 48 | 1995 | Suntory | 27–27 | - | Both teams obtained championship. | ||||||
| Sanyo Electric | |||||||||||
| 49 | 1996 | Toshiba Fuchu | 36–21 | Sanyo Electric | |||||||
| 50 | 1997 | Toshiba Fuchu | 14–6 | Suntory | |||||||
| 51 | 1998 | Toyota Motors | 28–27 | Suntory | |||||||
| 52 | 1999 | Kobe Steel | 35–26 | World Fighting Bull | |||||||
| 53 | 2000 | Kobe Steel | 29–26 | Toyota Motors | |||||||
| 54 | 2001 | Suntory | 50–31 | Kobe Steel | |||||||
| 55 | 2002 | Suntory | 38–25 | Toshiba Fuchu |