Who has the worst MLB season of all time?

Based on winning percentage, the 1899 Cleveland Spiders had the worst regular season in history at 20-134.

Who has the most losses in an MLB season?

The 1899 Cleveland Spiders have the record for most losses in an MLB season with 134 losses.

What is the worst record to make the MLB Postseason?

The worst teams by winning percentage to make the MLB postseason are the the 2020 Houston Astros who went 29-31, and the the 2020 Milwaukee Brewers who went 29-31.
Based on number of losses, the worst team to make the MLB postseason is the 2005 San Diego Padres, who made the postseason with a 82-80 record. The San Diego Padres lost to the St. Louis Cardinals in the NL Divisional Series.

Worst MLB Regular Season Records

Team Year Record
1 Cleveland Spiders  1899 20-134
2 Pittsburgh Alleghenys 1890 23-113
3 St. Louis Browns 1897 29-102
4 Philadelphia Athletics 1916 36-117
5 Boston Braves 1935 38-115
6 New York Mets 1962 40-120
7 Washington Senators 1904 38-113
8 Philadelphia Athletics 1919 36-104
9 St. Louis Browns 1898 39-111
10 Detroit Tigers 2003 43-119
11 Louisville Colonels  1895 35-96
12 Pittsburgh Pirates 1952 42-112
13 Washington Senators 1909 42-110
14 Louisville Colonels  1894 36-94
15 Philadelphia Phillies 1942 42-109
16 Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
Boston Red Sox 1932 43-111
19 Philadelphia Phillies 1928 43-109
Philadelphia Athletics 1915 43-109
21 Louisville Colonels  1896 38-93
22 Baltimore Orioles 2018 47-115
23 Boston Rustlers 1911 44-107
24 Detroit Tigers 2019 47-114
25 Boston Doves 1909 45-108
26 St. Louis Browns 1911 45-107
27 St. Louis Browns 1895 39-92
28 Philadelphia Phillies 1939 45-106
29 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
31 Philadelphia Phillies 1938 45-105
32 Boston Red Sox 1926 46-107
33 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
35 St. Louis Browns 1896 40-90
36 New York Mets 1965 50-112
37 Boston Red Sox 1925 47-105
38 Washington Senators  1893 40-89
39 Philadelphia Athletics 1920 48-106
40 Baltimore Orioles  1892 46-101
41 St. Louis Cardinals 1903 43-94
Washington Senators 1903 43-94
43 Houston Astros 2013 51-111
Arizona Diamondbacks 2004 51-111
New York Mets 1963 51-111
46 Brooklyn Superbas 1905 48-104
47 Pittsburgh Pirates 2020 19-41
48 Philadelphia Athletics 1946 49-105
Philadelphia Athletics 1943 49-105
St. Louis Cardinals 1908 49-105
Boston Americans 1906 49-105
Team Year Record
1 Cleveland Spiders  1899 20-134
2 New York Mets 1962 40-120
3 Detroit Tigers 2003 43-119
4 Philadelphia Athletics 1916 36-117
5 Boston Braves 1935 38-115
6 Baltimore Orioles 2018 47-115
7 Detroit Tigers 2019 47-114
8 Pittsburgh Alleghenys 1890 23-113
9 Washington Senators 1904 38-113
10 Pittsburgh Pirates 1952 42-112
11 New York Mets 1965 50-112
12 St. Louis Browns 1898 39-111
13 Philadelphia Phillies 1941 43-111
St. Louis Browns 1939 43-111
Boston Red Sox 1932 43-111
16 Houston Astros 2013 51-111
Arizona Diamondbacks 2004 51-111
New York Mets 1963 51-111
19 Washington Senators 1909 42-110
20 Baltimore Orioles 2021 52-110
Arizona Diamondbacks 2021 52-110
San Diego Padres 1969 52-110
Montreal Expos 1969 52-110
24 Philadelphia Phillies 1942 42-109
25 Philadelphia Phillies 1928 43-109
Philadelphia Athletics 1915 43-109
27 Detroit Tigers 1996 53-109
Toronto Blue Jays 1979 53-109
New York Mets 1964 53-109
30 Boston Doves 1909 45-108
31 Philadelphia Phillies 1945 46-108
St. Louis Browns 1937 46-108
33 Baltimore Orioles 2019 54-108
Florida Marlins 1998 54-108
Oakland Athletics 1979 54-108
36 Boston Rustlers 1911 44-107
37 St. Louis Browns 1911 45-107
38 Boston Red Sox 1926 46-107
39 Philadelphia Phillies 1961 47-107
St. Louis Browns 1910 47-107
41 Baltimore Orioles 1988 54-107
Toronto Blue Jays 1977 54-107
43 Washington Nationals 2022 55-107
Houston Astros 2012 55-107
Montreal Expos 1976 55-107
46 Philadelphia Phillies 1939 45-106
47 Philadelphia Athletics 1920 48-106
48 Atlanta Braves 1988 54-106
49 Detroit Tigers 2002 55-106
Tampa Bay Devil Rays 2002 55-106

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