Saikouisen Nihon Pro Mahjong Kyoukai (最高位戦日本プロ麻雀協会) is a professional mahjong organization with the longest history in Japan. Saikouisen USA is a branch of Saikouisen Nihon Pro Mahjong Kyoukai, similar to Saikouisen Kansai, Saikouisen Hokkaido and other branches within Japan. Saikouisen USA Headquarters is located in Los Angeles with more regional branches scheduled to start in 2026.