List of Chiba Lotte Marines seasons

The Chiba Lotte Marines are a professional baseball team in the Pacific League of Nippon Professional Baseball based in Chiba City, Chiba Prefecture in the Kantō region of Japan and owned by Lotte Holdings Co., Ltd.. They are a founding member of the Pacific League since its inception in 1950. Originally known as the Mainichi Orions, they won the inaugural 1950 Japan Series. In 1992, in conjunction with the move to Chiba Marine Stadium, the team rebranded to their current name.

In 76 seasons of play, the Marines have won the Japan Series four times (1950, 1974, 2005, 2010) while winning five Pacific League pennants.

In the playoff era of the Pacific League (1973–1982, 2004-present), the Marines have made the postseason fourteen times (1974, 1977, 1980, 1981, 2005, 2007, 2010, 2013, 2015, 2016, 2020, 2021, 2023, 2024).^[1]

^a This is determined by calculating the difference in wins plus the difference in losses divided by two.
^b The award was not open to the Pacific League until 1989. The award was not given out in the following years: 1971, 1980, 1984, 2000, 2019, and 2024.
^A Due to the COVID-19 pandemic in 2020, NPB saw both of their leagues modify their playoff format. The Pacific League decided to modify the traditional Climax Series format and eliminate the First Stage series to instead play only one modified Final Stage series while the Central League sent the first-place team directly to the Japan Series, which in this case was Yomiuri.
^B By tying Game 2 after winning the first game, Lotte ensured that the Eagles could do no better than tie the three-game series. A tied series results in the higher-seeded team advancing, therefore a Game 3 is not necessary since Lotte would advance no matter the outcome.^[5]