List of Japanese organizations
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The following is a list of organizations in Japan, pertaining to Japanese mahjong. As of May 2024, there are 2479 professionals among the Big Five organizations promoting modern riichi mahjong (not counting 101), up from about 1393 in October 2017.
| Organization | Japanese script | Inception | 2017 | 2018 | 2020 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|
| Japan Professional Mahjong League | 日本プロ麻雀連盟 | 1981 | 569 | 610 | 676 | 834 | 886 | 936 |
| Mahjong Union* | 麻将連合 | c. 1997 | 53* | 70* | 74* | 23 | 25 | 25 |
| Nihon Pro Mahjong Kyoukai | 日本プロ麻雀協会 | 2001 | 344 | 382 | 461 | 514 | 613 | 628 |
| Real Mahjong Unit* | RMU | 2007 | 54 | 57 | 64 | 98* | 102* | 107* |
| Saikouisen Nihon Pro Mahjong | 最高位戦日本プロ麻雀協会 | 1976 | 383 | 409 | 547 | 741 | 734 | 783 |
| 101 Kyougi Renmei | 101競技連盟 | 1982 | 23 | N/A | N/A | N/A | N/A | N/A |
| Total | 1393 | 1528 | 1822 | 2220 | 2370 | 2479 | ||
Note: An asterisk denotes that there is a difference in member status, not all members are considered "pros".