The 1978 Oakland Athletics and the 1978 St. Louis Cardinals share the MLB record for the longest losing streak within the same season at 11 straight games.
In the 1978 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 | Oakland Athletics | 11 | Jun 8 | Jun 18 | 3.1 runs |
| St. Louis Cardinals | 11 | May 12 | May 23 | 2.8 runs | |
| 3 | Seattle Mariners | 10 | Jun 7 | Jun 17 | 3.4 runs |
| 4 | Chicago White Sox | 9 | Jul 14 | Jul 23 | 4.3 runs |
| Minnesota Twins | 9 | Apr 16 | Apr 26 | 2.3 runs | |
| Minnesota Twins | 9 | Jul 13 | Jul 21 | 2.0 runs | |
| Oakland Athletics | 9 | Aug 20 | Aug 29 | 3.9 runs | |
| Seattle Mariners | 9 | Sep 18 | Sep 26 | 3.0 runs | |
| Toronto Blue Jays | 9 | Jun 4 | Jun 14 | 2.9 runs | |
| 10 | Baltimore Orioles | 8 | Jun 23 | Jun 29 | 4.0 runs |
| Seattle Mariners | 8 | Apr 8 | Apr 15 | 3.0 runs | |
| Texas Rangers | 8 | Jul 18 | Jul 25 | 3.5 runs | |
| Texas Rangers | 8 | Apr 11 | Apr 23 | 3.2 runs | |
| Toronto Blue Jays | 8 | Sep 23 | Oct 1 | 4.0 runs | |
| 15 | Atlanta Braves | 7 | Aug 20 | Aug 27 | 3.7 runs |
| Atlanta Braves | 7 | Sep 24 | Oct 1 | 2.7 runs | |
| California Angels | 7 | May 27 | Jun 3 | 5.3 runs | |
| Detroit Tigers | 7 | Jun 12 | Jun 18 | 4.0 runs | |
| Detroit Tigers | 7 | May 24 | May 29 | 1.6 runs | |
| Houston Astros | 7 | Jul 19 | Jul 23 | 4.0 runs | |
| Minnesota Twins | 7 | Aug 20 | Aug 26 | 3.0 runs | |
| Montreal Expos | 7 | Jul 21 | Jul 28 | 2.6 runs | |
| Oakland Athletics | 7 | Aug 11 | Aug 18 | 2.6 runs | |
| Pittsburgh Pirates | 7 | Jul 22 | Jul 29 | 1.9 runs | |
| San Francisco Giants | 7 | Sep 9 | Sep 15 | 4.7 runs | |
| Seattle Mariners | 7 | May 27 | Jun 4 | 3.9 runs | |
| St. Louis Cardinals | 7 | Jul 28 | Aug 4 | 2.7 runs | |
| St. Louis Cardinals | 7 | Apr 17 | Apr 24 | 2.6 runs | |
| 29 | Chicago Cubs | 6 | Jun 20 | Jun 25 | 3.7 runs |
| Chicago White Sox | 6 | May 21 | May 27 | 3.5 runs | |
| Cincinnati Reds | 6 | Aug 24 | Aug 29 | 3.2 runs | |
| Cincinnati Reds | 6 | Jun 27 | Jul 1 | 3.0 runs | |
| Cleveland Indians | 6 | Sep 24 | Sep 30 | 3.0 runs | |
| Houston Astros | 6 | Aug 17 | Aug 20 | 2.2 runs | |
| Los Angeles Dodgers | 6 | Jul 30 | Aug 4 | 1.2 runs | |
| Minnesota Twins | 6 | Jun 4 | Jun 11 | 2.3 runs | |
| Montreal Expos | 6 | Jun 10 | Jun 14 | 3.0 runs | |
| New York Mets | 6 | Apr 23 | Apr 29 | 2.7 runs | |
| Oakland Athletics | 6 | Sep 19 | Sep 25 | 4.5 runs | |
| St. Louis Cardinals | 6 | Jun 12 | Jun 18 | 4.2 runs | |
| Toronto Blue Jays | 6 | Jun 17 | Jun 24 | 4.8 runs | |
| Toronto Blue Jays | 6 | Aug 15 | Aug 19 | 4.7 runs | |
| Toronto Blue Jays | 6 | Sep 1 | Sep 6 | 3.0 runs | |
| Toronto Blue Jays | 6 | Jul 9 | Jul 17 | 2.3 runs | |
| 45 | Atlanta Braves | 5 | Sep 1 | Sep 4 | 3.2 runs |
| Baltimore Orioles | 5 | Apr 7 | Apr 12 | 6.8 runs | |
| Baltimore Orioles | 5 | Aug 5 | Aug 9 | 1.8 runs | |
| Boston Red Sox | 5 | Jul 20 | Jul 24 | 3.4 runs | |
| Boston Red Sox | 5 | Sep 12 | Sep 16 | 1.6 runs | |
| California Angels | 5 | Jun 23 | Jun 26 | 5.0 runs | |
| California Angels | 5 | Aug 25 | Aug 29 | 3.4 runs | |
| Chicago Cubs | 5 | Sep 4 | Sep 7 | 2.8 runs | |
| Chicago White Sox | 5 | Aug 30 | Sep 2 | 5.4 runs | |
| Cleveland Indians | 5 | Aug 15 | Aug 19 | 2.8 runs | |
| Cleveland Indians | 5 | Aug 10 | Aug 13 | 2.8 runs | |
| Cleveland Indians | 5 | Jun 12 | Jun 17 | 2.2 runs | |
| Houston Astros | 5 | Jun 23 | Jun 26 | 2.6 runs | |
| Houston Astros | 5 | Apr 6 | Apr 10 | 2.6 runs | |
| Kansas City Royals | 5 | May 1 | May 6 | 3.4 runs | |
| Kansas City Royals | 5 | Jun 27 | Jul 1 | 2.0 runs | |
| Los Angeles Dodgers | 5 | May 31 | Jun 5 | 2.8 runs | |
| Milwaukee Brewers | 5 | Aug 5 | Aug 10 | 4.8 runs | |
| Montreal Expos | 5 | Aug 27 | Aug 31 | 4.4 runs | |
| New York Mets | 5 | Sep 21 | Sep 25 | 3.4 runs | |
| Oakland Athletics | 5 | Jul 6 | Jul 9 | 2.2 runs | |
| Philadelphia Phillies | 5 | Jun 11 | Jun 15 | 2.6 runs | |
| Philadelphia Phillies | 5 | Aug 13 | Aug 18 | 2.4 runs | |
| Pittsburgh Pirates | 5 | Apr 9 | Apr 14 | 3.2 runs | |
| Pittsburgh Pirates | 5 | Sep 7 | Sep 11 | 2.8 runs | |
| San Diego Padres | 5 | Aug 5 | Aug 9 | 2.8 runs | |
| Seattle Mariners | 5 | Jul 26 | Jul 30 | 4.2 runs | |
| Seattle Mariners | 5 | Aug 25 | Aug 29 | 3.8 runs | |
| St. Louis Cardinals | 5 | May 25 | May 29 | 4.6 runs | |
| Texas Rangers | 5 | Jul 29 | Aug 1 | 3.8 runs | |
| Texas Rangers | 5 | Jun 13 | Jun 16 | 3.6 runs | |
| Toronto Blue Jays | 5 | May 2 | May 7 | 5.0 runs |
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