List of Eastern League champions
The Eastern League of Minor League Baseball is one of three Double-A baseball leagues in the United States. A league champion is determined at the end of each season. Champions have been determined by postseason playoffs, winning the regular season pennant, or being declared champion by the league office. As of 2019, the league operates under a split season format in which the first place teams from each division in both the first and second halves of the season qualify for the playoffs. In the event that the same team wins both halves, the team with the best win–loss record over the full season qualifies. The first and second half winners then compete in a best-of-five series to determine division champions. The division winners then play each other in a best-of-five series to determine a league champion.
League champions
Championship wins by team
Active Eastern League teams appear in bold.| Wins | Team | Championship years |
| 10 | Binghamton Triplets | 1929, 1933, 1935, 1940, 1944, 1949, 1952, 1953, 1958, 1967 |
| 8 | Elmira Colonels/Pioneers/Royals | 1937, 1938, 1941, 1943, 1962, 1964, 1966, 1971 |
| 7 | Scranton Miners/Red Sox | 1926, 1936, 1939, 1942, 1946, 1948, 1951 |
| 6 | Harrisburg Senators | 1987, 1993, 1996, 1997, 1998, 1999 |
| 5 | Akron Aeros/RubberDucks | 2003, 2005, 2009, 2012, 2016 |
| 5 | West Haven Yankees/A's | 1982, 1972, 1976, 1977, 1979 |
| 4 | Trenton Thunder | 2007, 2008, 2013, 2019 |
| 4 | Reading Phillies | 1968, 1973, 1995, 2001 |
| 4 | Williamsport Billies/Grays | 1923, 1924, 1934, 1960 |
| 3 | New Hampshire Fisher Cats | 2004, 2011, 2018 |
| 3 | Albany-Colonie Yankees | 1988, 1989, 1991 |
| 3 | Binghamton Mets | 1992, 1994, 2014 |
| 3 | Bristol Red Sox | 1975, 1978, 1981 |
| 3 | Harrisburg Senators | 1927, 1928, 1931 |
| 3 | Springfield Giants | 1959, 1960, 1961 |
| 3 | Vermont Reds | 1984, 1985, 1986 |
| 3 | Wilkes-Barre Barons/Indians | 1930, 1932, 1950 |
| 2 | Albany Senators | 1945, 1954 |
| 2 | Altoona Curve | 2010, 2017 |
| 2 | New Britain Red Sox/Rock Cats | 1983, 2001 |
| 2 | York White Roses/Pirates | 1925, 1969 |
| 1 | Allentown Cardinals | 1955 |
| 1 | Bowie Baysox | 2015 |
| 1 | Charleston Indians | 1963 |
| 1 | Holyoke Millers | 1980 |
| 1 | London Tigers | 1990 |
| 1 | New Haven Ravens | 2000 |
| 1 | Norwich Navigators | 2002 |
| 1 | Pittsfield Red Sox | 1965 |
| 1 | Portland Sea Dogs | 2006 |
| 1 | Reading Indians | 1957 |
| 1 | Schenectady Blue Jays | 1956 |
| 1 | Thetford Mines Pirates | 1974 |
| 1 | Utica Blue Sox | 1947 |
| 1 | Waterbury Pirates | 1970 |