The Seibu Lions (in Kanji, 西武ライオンズ) are a professional baseball team in Japan's Pacific League and are owned by Yoshiaki Tsutsumi, who was once listed as the world's richest man.
- Founded: 1950
- Formerly known as: Nishitetsu Clippers (1950), Nishitetsu Lions (1951-1972), Taiheiyo Club Lions (1973-1976), Crown Lighter Lions(1977-1978), Seibu Lions (1979-)
- Home ballpark: Seibu Invoice Dome
- Uniform colors: Blue, White and Green
- Logo design: A white lions's head on a green field.
- League championships won (20): 1954,1956, 1957, 1958, 1963, 1982, 1983, 1985, 1986, 1987, 1988, 1990, 1991, 1992, 1993, 1994, 1997, 1998, 2002, 2004
- Japan Series championships won (12): 1956, 1957, 1958, 1982, 1983, 1986, 1987, 1988, 1990, 1991, 1992, 2004
The first Japanese infielder to play in Major League Baseball, Kazuo Matsui of the New York Mets, used to play for the Seibu Lions. The Lions' top stars of the 2004 season are players like Alex Cabrera, Daisuke Matsuzaka and Chang Chih-Chia who helped them reach the Japan Series once more.
Players of note
Current stars
Retired numbers
none
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