Teiko National Basketball League

The Teiko National Basketball League (TNBL) is a men's professional basketball league in Teiko composed of twelve company sponsored or franchised teams that represents different prefectures of the country. The twelve-team league is divided into two conferences, the Eastern Conference, and the Western Conference. It is recognized by FIBA (also known as the International Basketball Federation) as the national governing body for basketball in Teiko. TNBL is one of the four major sports league in Teiko alongside with Teiko National Football League, Teiko Major League Baseball and Teiko Volleyball League.

TNBL is the second professional basketball league in Asia after the Philippine Basketball Association and is the third oldest continuously existing in the world after the NBA and PBA. The league's regulations are a hybrid of rules from FIBA and the NBA. As of 2014, the 2013-2014 TNBL Premier Cup Season is the most watched Televised sports event in Teiko with an estimate of almost three million viewers.

The league played its first game at the Coliseum in Kaijo on April 9, 1976. Its individual team offices are directed out of TNBL head offices located in Shimazaki Ward in Kaijo with a satellite office in Shinto Ward in Rakuzan. The league is currently headed by Commissioner Aida Kagetora, the father of the Minister for Health, Education, Culture and Sports, Aida Riko.