The 1928 Philadelphia Phillies and the 1928 Philadelphia Phillies share the MLB record for the longest losing streak within the same season at 12 straight games.
In the 1928 MLB season, there were no losing streaks that were in the all time top 50 losing streaks in the same season.
| Team | Losing Streak | Start | End | Avg Margin of Defeat | |
|---|---|---|---|---|---|
| 1 | Philadelphia Phillies | 12 | Sep 12 | Sep 24 | 3.2 runs |
| Philadelphia Phillies | 12 | Jul 7 | Jul 20 | 2.1 runs | |
| 3 | Cleveland Indians | 11 | Sep 2 | Sep 16 | 4.3 runs |
| 4 | Boston Braves | 10 | Sep 8 | Sep 14 | 4.7 runs |
| Boston Braves | 10 | Jul 8 | Jul 18 | 4.5 runs | |
| Philadelphia Phillies | 10 | May 5 | May 14 | 4.0 runs | |
| 7 | St. Louis Browns | 9 | May 8 | May 22 | 4.8 runs |
| Philadelphia Phillies | 9 | May 27 | Jun 6 | 2.8 runs | |
| Washington Senators | 9 | May 15 | May 25 | 2.1 runs | |
| 10 | New York Giants | 8 | Aug 23 | Aug 31 | 4.8 runs |
| Washington Senators | 8 | Apr 20 | May 1 | 4.4 runs | |
| Cincinnati Reds | 8 | Jul 30 | Aug 8 | 3.9 runs | |
| Boston Braves | 8 | Jun 9 | Jun 16 | 3.6 runs | |
| 14 | St. Louis Browns | 7 | Jul 26 | Aug 1 | 5.0 runs |
| Chicago White Sox | 7 | Jul 25 | Jul 29 | 4.9 runs | |
| Chicago White Sox | 7 | May 1 | May 8 | 4.7 runs | |
| Boston Braves | 7 | Jun 23 | Jun 30 | 4.6 runs | |
| Boston Red Sox | 7 | Jul 24 | Jul 28 | 4.3 runs | |
| Cleveland Indians | 7 | Jun 3 | Jun 12 | 2.7 runs | |
| Detroit Tigers | 7 | May 11 | May 17 | 2.7 runs | |
| Washington Senators | 7 | Jul 11 | Jul 19 | 2.7 runs | |
| 22 | Pittsburgh Pirates | 6 | May 25 | May 30 | 5.2 runs |
| Boston Red Sox | 6 | Jul 3 | Jul 7 | 4.7 runs | |
| Boston Red Sox | 6 | Aug 6 | Aug 12 | 4.3 runs | |
| Philadelphia Phillies | 6 | Aug 22 | Aug 28 | 4.0 runs | |
| Boston Braves | 6 | Aug 21 | Aug 26 | 3.7 runs | |
| Philadelphia Athletics | 6 | Jun 24 | Jun 28 | 3.5 runs | |
| Philadelphia Phillies | 6 | Jun 23 | Jun 28 | 3.3 runs | |
| 29 | Philadelphia Phillies | 5 | Jul 31 | Aug 4 | 9.6 runs |
| Boston Red Sox | 5 | Jul 12 | Jul 16 | 6.0 runs | |
| Boston Braves | 5 | May 4 | May 9 | 5.4 runs | |
| Boston Red Sox | 5 | May 28 | Jun 2 | 4.6 runs | |
| Philadelphia Athletics | 5 | May 25 | May 28 | 4.4 runs | |
| Pittsburgh Pirates | 5 | Jul 1 | Jul 6 | 4.4 runs | |
| Cleveland Indians | 5 | Aug 19 | Aug 24 | 4.0 runs | |
| Chicago White Sox | 5 | Aug 25 | Sep 1 | 3.8 runs | |
| St. Louis Cardinals | 5 | Sep 30 | Oct 9 | 3.8 runs | |
| Washington Senators | 5 | Jul 29 | Aug 2 | 3.6 runs | |
| St. Louis Browns | 5 | Jul 19 | Jul 21 | 3.4 runs | |
| Detroit Tigers | 5 | Jun 11 | Jun 15 | 3.2 runs | |
| Boston Red Sox | 5 | Apr 24 | May 1 | 3.2 runs | |
| St. Louis Browns | 5 | Apr 16 | Apr 20 | 3.2 runs | |
| Boston Red Sox | 5 | Jul 30 | Aug 2 | 3.0 runs | |
| Boston Red Sox | 5 | Apr 11 | Apr 18 | 3.0 runs | |
| Cincinnati Reds | 5 | Sep 22 | Sep 25 | 3.0 runs | |
| Cleveland Indians | 5 | Jul 15 | Jul 17 | 3.0 runs | |
| Philadelphia Phillies | 5 | May 18 | May 25 | 2.8 runs | |
| Cincinnati Reds | 5 | Aug 27 | Sep 2 | 2.4 runs | |
| Chicago White Sox | 5 | Sep 24 | Sep 29 | 2.4 runs | |
| Chicago Cubs | 5 | Aug 5 | Aug 8 | 2.2 runs | |
| Cleveland Indians | 5 | May 27 | Jun 1 | 2.0 runs | |
| Boston Braves | 5 | May 14 | May 19 | 1.6 runs | |
| Detroit Tigers | 5 | Sep 2 | Sep 4 | 1.6 runs | |
| Brooklyn Robins | 5 | May 7 | May 12 | 1.4 runs | |
| Boston Red Sox | 5 | Aug 20 | Aug 23 | 1.2 runs |
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