List of Major League Baseball 100 win seasons
Over the course of 127 seasons (from 1892 to 2021 excluding 1981, 1994, and 2020), 112 teams have won 100 or more games in a single Major League Baseball season. While this makes the feat a relatively common occurrence, the 100-win threshold remains the hallmark of the best teams in a given season. While there have been 24 seasons with two or more 100-win teams, only nine times have at least three teams finished at or above the mark, and 2019 has been the only instance of four teams finishing  at or above the 100-win threshold. The 2018 season was the first time either league had more than two teams win 100 or more games in the same season; the Boston Red Sox, Houston Astros, and New York Yankees of the American League each won 100 or more games, with two led by rookie managers (no season had ever seen more than 100 wins from two managers before). There were no 100-win teams in the National League that season. The 2019 season marked the first time four Major League teams won 100 or more games, with the American  League's Houston Astros, New York Yankees, and Minnesota Twins winning their divisions with at least 100 wins, and the Los Angeles Dodgers of the National League doing the same. On eight occasions, the level of high-quality competition within a league or division has resulted in a team winning 100 games but still failing to qualify for postseason play. Six of these eight seasons occurred before the start of the two-division league structure and expanded playoff format introduced in 1969, but none have occurred since the first year under the Divisional Series format in 1995. With the Divisional  Series and Wild Card format in place today, it is extremely unlikely for a team with a 100-win regular season to fail to qualify for at least a Wild Card berth. Only the 2001 Oakland Athletics, the 2018 New York Yankees, and the 2021 Los Angeles Dodgers made the playoffs as 100-win Wild Card teams. The following teams missed the postseason despite winning 100 games during the regular season: Sixty different managers have led a team to a 100-win season (with one occasion where a 100-win team was led by multiple managers.) Twenty-three managers have  lead a team to two or more 100-win seasons; Sparky Anderson, Whitey Herzog, and Tony La Russa are the only managers to have led multiple teams to a 100-win season. Joe McCarthy and Bobby Cox have the most 100-win seasons by a manager with six. Eight of the 30 major league teams have never recorded a season with 100 wins, while eight managers have accomplished 100 wins in their rookie season, with the first being Mickey Cochrane in 1934 and the current last one being Rocco Baldelli in 2019. Listed below are the Major League Baseball teams  that have had seasons with 100 or more wins.