The Philadelphia Phillies have the longest losing streak of regular season games in MLB history at 23 straight games. During this streak they lost to their opponents by an average of 3.4 runs. The streak occurred entirely during the 1961 season.
The Cincinnati Reds have the longest losing active streak of regular season games at 7 straight games. The streak started in the 2022 season with a loss to the Arizona Diamondbacks. The most recent loss was to the Los Angeles Dodgers in 2022.
| Team | Year(s) | Losing Streak | Avg Margin of Defeat | |
|---|---|---|---|---|
| 1 | Philadelphia Phillies | 1961 | 23 | 3.4 runs |
| 2 | Baltimore Orioles | 1988 | 21 | 4.0 runs |
| 3 | Montreal Expos | 1969 | 20 | 3.8 runs |
| Philadelphia Athletics | 1943 | 20 | 2.6 runs | |
| Philadelphia Athletics | 1916 | 20 | 4.2 runs | |
| Boston Americans | 1906 | 20 | 4.2 runs | |
| 7 | Baltimore Orioles | 2021 | 19 | 5.7 runs |
| Kansas City Royals | 2005 | 19 | 4.4 runs | |
| Detroit Tigers | 1975 | 19 | 2.9 runs | |
| Cincinnati Reds | 1914 | 19 | 3.6 runs | |
| Boston Beaneaters | 1906 | 19 | 4.1 runs | |
| 12 | Washington Senators | 1959 | 18 | 4.2 runs |
| Washington Senators | 1948 | 18 | 3.8 runs | |
| Philadelphia Athletics | 1920 | 18 | 2.8 runs | |
| 15 | Arizona Diamondbacks | 2021 | 17 | 3.2 runs |
| Seattle Mariners | 2011 | 17 | 3.4 runs | |
| Atlanta Braves | 1977 | 17 | 5.1 runs | |
| New York Mets | 1962 | 17 | 3.3 runs | |
| Boston Red Sox | 1926 | 17 | 3.6 runs | |
| 20 | Chicago Cubs | 1996 - 1997 | 16 | 3.0 runs |
| Brooklyn Dodgers | 1944 | 16 | 4.1 runs | |
| Cincinnati Reds | 1937 - 1938 | 16 | 3.1 runs | |
| St. Louis Cardinals | 1916 - 1917 | 16 | 3.4 runs | |
| Boston Rustlers | 1911 | 16 | 5.2 runs | |
| Boston Doves | 1907 | 16 | 2.3 runs | |
| Boston Americans | 1907 | 16 | 3.1 runs | |
| 27 | Houston Astros | 2013 | 15 | 3.7 runs |
| Tampa Bay Devil Rays | 2002 | 15 | 2.7 runs | |
| New York Mets | 1982 | 15 | 2.1 runs | |
| Texas Rangers | 1972 | 15 | 2.9 runs | |
| Chicago White Sox | 1967 - 1968 | 15 | 2.8 runs | |
| New York Mets | 1963 | 15 | 3.9 runs | |
| Philadelphia Athletics | 1937 | 15 | 3.5 runs | |
| Boston Braves | 1935 | 15 | 5.2 runs | |
| Boston Red Sox | 1927 | 15 | 3.9 runs | |
| Boston Braves | 1927 | 15 | 3.3 runs | |
| Boston Doves | 1909 | 15 | 3.2 runs | |
| St. Louis Cardinals | 1909 | 15 | 3.5 runs | |
| 39 | Los Angeles Angels | 2022 | 14 | 3.2 runs |
| Baltimore Orioles | 2021 | 14 | 3.2 runs | |
| Arizona Diamondbacks | 2004 | 14 | 4.1 runs | |
| Seattle Mariners | 1992 | 14 | 3.0 runs | |
| Minnesota Twins | 1982 | 14 | 3.9 runs | |
| Oakland Athletics | 1977 | 14 | 3.4 runs | |
| Washington Senators | 1970 | 14 | 3.1 runs | |
| Washington Senators | 1961 | 14 | 3.9 runs | |
| Baltimore Orioles | 1954 | 14 | 3.6 runs | |
| Pittsburgh Pirates | 1954 - 1955 | 14 | 4.4 runs | |
| St. Louis Browns | 1953 | 14 | 4.4 runs | |
| Philadelphia Athletics | 1945 | 14 | 3.8 runs | |
| St. Louis Browns | 1940 | 14 | 4.0 runs | |
| Brooklyn Dodgers | 1937 | 14 | 3.0 runs | |
| Philadelphia Phillies | 1936 | 14 | 3.1 runs | |
| Boston Braves | 1935 | 14 | 4.3 runs | |
| Boston Red Sox | 1930 | 14 | 4.3 runs | |
| Philadelphia Phillies | 1927 | 14 | 4.8 runs | |
| Boston Rustlers | 1911 | 14 | 3.1 runs | |
| St. Louis Browns | 1911 | 14 | 4.4 runs | |
| St. Louis Cardinals | 1905 | 14 | 3.9 runs |
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