Dai Tokyo (1936) → Lion Baseball Club (1937–1940) → Asahi Baseball Club (1941–1944) → Pacific Baseball Club (1946) → Taiyō Robins(1947–1949) → To the Central League (later renamed the Shochiku Robins; present: Yokohama BayStars)
Korakuen Eagles (1937s) → Eagles Baseball Club (1938–1939) → Kurowashi Baseball Club (1940–1941) → Yamato Baseball Club (1942–1943) → Broken up
Nagoya Baseball Club (1936–1943) → Sangyo Baseball Club (1944) → Chubu Nippon (1946) → Chubu Nippon Dragons (1947) → Chunichi Dragons (1948–1949) → To the Central League
Osaka Tigers (1936–September 24, 1940, Nicknamed "Tigers") → Hanshin Baseball Club (September 25, 1940–1944) → Osaka Tigers (1946–1949, Nicknamed "Hanshin") → To the Central League (Present: Hanshin Tigers)
Tokyo Kyojin (1936–1944; 1946) → Yomiuri Giants (1947–1949) → To the Central League
Tokyo Senators (1936–1939) → Tsubasa Baseball Club (1940) → Taiyō Baseball Club (1941–1942) → Nishitetsu Baseball Club (1943) → Broken up
Hankyu Baseball Club (1936–1944; 1946) → Hankyu Bears (January, 1947–April, 1947) → Hankyu Braves (April, 1947–1949) → To the Pacific League (Present: Orix Buffaloes)
Nankai Baseball Club (1938f–May 31, 1944) → Kinki Nippon (June 1, 1944–December 31, 1944) → Kinki Great Ring (1946–May 31, 1947) → Nankai Hawks (June 1, 1947–1949) → To the Pacific League (Present: Fukuoka SoftBank Hawks)
Gold Star (1946) → Kinsei Stars (1947–1948) → Daiei Stars The Daiei Stars merged with the Takahashi Unions in 1956 to form the Daiei Unions, which later merged with the Mainichi Orions in 1957 to form the Daimai Orions (1949) (present: Chiba Lotte Marines)
Senators Baseball Club (1946) → Tokyu Flyers (1949) → Kyuei Flyers (1948) → Tokyu Flyers (1947) → To the Pacific League (Present: Hokkaido Nippon-Ham Fighters)
Kintetsu Pearls (1949) The Pearls did not play the 1949 JBL season. → To the Pacific League (Present: Orix Buffaloes)
Extinct clubs
Korakuen Eagles (1937s) → Eagles Baseball Club (1938–1939) → Kurowashi Baseball Club (1940–1941) → Yamato Baseball Club (1942–1943) → Broken up