In 1951, the Nishi Nippon Pirates merged with the Nishitetsu Clippers to form the Nishitetsu Lions.
Chunichi Dragons | Hanshin Tigers | Hiroshima Toyo Carp | Tokyo Yakult Swallows | Yokohama DeNA BayStars | Yomiuri Giants
Pacific League Chiba Lotte Marines | Fukuoka SoftBank Hawks | Hokkaido Nippon-Ham Fighters | Orix Buffaloes | Saitama Seibu Lions | Tohoku Rakuten Golden Eagles
Defunct teams Daiei Stars | Nagoya Kinko | Nishitetsu Baseball Club | Nishi Nippon Pirates | Orix BlueWave | Osaka Kintetsu Buffaloes | Shochiku Robins | Takahashi Unions