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| 9 World Series championship seasons: 1903, 1912, 1915, 1916, 1918, 2004, 2007, 2013, 2018 |
| Last World Series championship: 2018, 6 seasons ago |
| Boston Americans became Boston Red Sox in 1908 |
| Best finish: |
| beat Pittsburgh in World Series in 1903 season |
| beat NY Giants in World Series in 1912 season |
| beat Philadelphia in World Series in 1915 season |
| beat Brooklyn in World Series in 1916 season |
| beat Chi Cubs in World Series in 1918 season |
| beat St Louis in World Series in 2004 season |
| beat Colorado in World Series in 2007 season |
| beat St Louis in World Series in 2013 season |
| beat LA Dodgers in World Series in 2018 season |
| TEAM | SEASON | RECORD | PERC | DIV STAND | GB | LEAGUE | PLAYOFFS |
| Bos Americans | 1901 | 79-57 | .581 | 2nd AL | - 4.0 | ||
| Bos Americans | 1902 | 77-60 | .562 | 3rd AL | - 6.5 | ||
| %Bos Americans | 1903 | 91-47 | .659 | 1st AL | +14.5 | WPit | |
| Bos Americans | 1904 | 95-59 | .617 | 1st AL | + 1.5 | ||
| Bos Americans | 1905 | 78-74 | .513 | 4th AL | -16.0 | ||
| Bos Americans | 1906 | 49-105 | .318 | 8th AL | -45.5 | ||
| Bos Americans | 1907 | 59-90 | .396 | 7th AL | -32.5 | ||
| Boston | 1908 | 75-79 | .487 | 5th AL | -15.5 | ||
| Boston | 1909 | 88-63 | .583 | 3rd AL | - 9.5 | ||
| Boston | 1910 | 81-72 | .529 | 4th AL | -22.5 | ||
| Boston | 1911 | 78-75 | .510 | 5th AL | -24.0 | ||
| %Boston | 1912 | 105-47 | .691 | 1st AL | +14.0 | WNYG | |
| Boston | 1913 | 79-71 | .527 | 4th AL | -15.5 | ||
| Boston | 1914 | 91-62 | .595 | 2nd AL | - 8.5 | ||
| %Boston | 1915 | 101-50 | .669 | 1st AL | + 2.5 | WPhi | |
| %Boston | 1916 | 91-63 | .591 | 1st AL | + 2.0 | WBkn | |
| Boston | 1917 | 90-62 | .592 | 2nd AL | - 9.0 | ||
| %Boston | 1918 | 75-51 | .595 | 1st AL | + 1.5 | WChC | |
| Boston | 1919 | 66-71 | .482 | 6th AL | -20.5 | ||
| Boston | 1920 | 72-81 | .471 | 5th AL | -25.5 | ||
| Boston | 1921 | 75-79 | .487 | 5th AL | -23.5 | ||
| Boston | 1922 | 61-93 | .396 | 8th AL | -33.0 | ||
| Boston | 1923 | 61-91 | .401 | 8th AL | -37.0 | ||
| Boston | 1924 | 67-87 | .435 | 7th AL | -25.0 | ||
| Boston | 1925 | 47-105 | .309 | 8th AL | -49.5 | ||
| Boston | 1926 | 46-107 | .301 | 8th AL | -44.5 | ||
| Boston | 1927 | 51-103 | .331 | 8th AL | -59.0 | ||
| Boston | 1928 | 57-96 | .373 | 8th AL | -43.5 | ||
| Boston | 1929 | 58-96 | .377 | 8th AL | -48.0 | ||
| Boston | 1930 | 52-102 | .338 | 8th AL | -50.0 | ||
| Boston | 1931 | 62-90 | .408 | 6th AL | -45.0 | ||
| Boston | 1932 | 43-111 | .279 | 8th AL | -64.0 | ||
| Boston | 1933 | 63-86 | .423 | 7th AL | -34.5 | ||
| Boston | 1934 | 76-76 | .500 | 4th AL | -24.0 | ||
| Boston | 1935 | 78-75 | .510 | 4th AL | -16.0 | ||
| Boston | 1936 | 74-80 | .481 | 6th AL | -28.5 | ||
| Boston | 1937 | 80-72 | .526 | 5th AL | -21.0 | ||
| Boston | 1938 | 88-61 | .591 | 2nd AL | - 9.5 | ||
| Boston | 1939 | 89-62 | .589 | 2nd AL | -17.0 | ||
| Boston | 1940 | 82-72 | .532 | T4th AL | - 8.0 | ||
| Boston | 1941 | 84-70 | .545 | 2nd AL | -17.0 | ||
| Boston | 1942 | 93-59 | .612 | 2nd AL | - 9.0 | ||
| Boston | 1943 | 68-84 | .447 | 7th AL | -29.0 | ||
| Boston | 1944 | 77-77 | .500 | 4th AL | -12.0 | ||
| Boston | 1945 | 71-83 | .461 | 7th AL | -17.5 | ||
| Boston | 1946 | 104-50 | .675 | 1st AL | +12.0 | LStL | |
| Boston | 1947 | 83-71 | .539 | 3rd AL | -14.0 | ||
| Boston | 1948 | 96-59 | .619 | *2nd AL | - 1.0 | ||
| Boston | 1949 | 96-58 | .623 | 2nd AL | - 1.0 | ||
| Boston | 1950 | 94-60 | .610 | 3rd AL | - 4.0 | ||
| Boston | 1951 | 87-67 | .565 | 3rd AL | -11.0 | ||
| Boston | 1952 | 76-78 | .494 | 6th AL | -19.0 | ||
| Boston | 1953 | 84-69 | .549 | 4th AL | -16.0 | ||
| Boston | 1954 | 69-85 | .448 | 4th AL | -42.0 | ||
| Boston | 1955 | 84-70 | .545 | 4th AL | -12.0 | ||
| Boston | 1956 | 84-70 | .545 | 4th AL | -13.0 | ||
| Boston | 1957 | 82-72 | .532 | 3rd AL | -16.0 | ||
| Boston | 1958 | 79-75 | .513 | 3rd AL | -13.0 | ||
| Boston | 1959 | 75-79 | .487 | 5th AL | -19.0 | ||
| Boston | 1960 | 65-89 | .422 | 7th AL | -32.0 | ||
| Boston | 1961 | 76-86 | .469 | 6th AL | -33.0 | ||
| Boston | 1962 | 76-84 | .475 | 8th AL | -19.0 | ||
| Boston | 1963 | 76-85 | .472 | 7th AL | -28.0 | ||
| Boston | 1964 | 72-90 | .444 | 8th AL | -27.0 | ||
| Boston | 1965 | 62-100 | .383 | 9th AL | -40.0 | ||
| Boston | 1966 | 72-90 | .444 | 9th AL | -26.0 | ||
| Boston | 1967 | 92-70 | .568 | 1st AL | + 1.0 | LStL | |
| Boston | 1968 | 86-76 | .531 | 4th AL | -17.0 | ||
| Boston | 1969 | 87-75 | .537 | 3rd AL East | -22.0 | ||
| Boston | 1970 | 87-75 | .537 | 3rd AL East | -21.0 | ||
| Boston | 1971 | 85-77 | .525 | 3rd AL East | -18.0 | ||
| Boston | 1972 | 85-70 | .548 | 2nd AL East | - 0.5 | ||
| Boston | 1973 | 89-73 | .549 | 2nd AL East | - 8.0 | ||
| Boston | 1974 | 84-78 | .519 | 3rd AL East | - 7.0 | ||
| Boston | 1975 | 95-65 | .594 | 1st AL East | + 4.5 | WOak LCin | |
| Boston | 1976 | 83-79 | .512 | 3rd AL East | -15.5 | ||
| Boston | 1977 | 97-64 | .602 | T2nd AL East | - 2.5 | ||
| Boston | 1978 | 99-64 | .607 | *2nd AL East | - 1.0 | ||
| Boston | 1979 | 91-69 | .569 | 3rd AL East | -11.5 | ||
| Boston | 1980 | 83-77 | .519 | 4th AL East | -19.0 | ||
| Boston | 1981a | 30-26 | .536 | 5th AL East | - 4.0 | ||
| Boston | 1981b | 29-23 | .558 | T2nd AL East | - 1.5 | ||
| Boston | 1982 | 89-73 | .549 | 3rd AL East | - 6.0 | ||
| Boston | 1983 | 78-84 | .481 | 6th AL East | -20.0 | ||
| Boston | 1984 | 86-76 | .481 | 4th AL East | -18.0 | ||
| Boston | 1985 | 81-81 | .500 | 5th AL East | -18.5 | ||
| Boston | 1986 | 95-66 | .590 | 1st AL East | + 5.5 | WCal LNYM | |
| Boston | 1987 | 78-84 | .481 | 5th AL East | -20.0 | ||
| Boston | 1988 | 89-73 | .549 | 1st AL East | + 1.0 | LOak | |
| Boston | 1989 | 83-79 | .512 | 3rd AL East | - 6.0 | ||
| Boston | 1990 | 88-74 | .543 | 1st AL East | + 2.0 | LOak | |
| Boston | 1991 | 84-78 | .519 | T2nd AL East | - 7.0 | ||
| Boston | 1992 | 73-89 | .451 | 7th AL East | -23.0 | ||
| Boston | 1993 | 80-82 | .494 | 5nd AL East | -15.0 | ||
| Boston | 1994 | 54-61 | .470 | 4th AL East | -17.0 | 7th AL | |
| Boston | 1995 | 86-58 | .597 | 1st AL East | + 7.0 | 2nd AL | LCle |
| Boston | 1996 | 85-77 | .525 | 3rd AL East | - 7.0 | T6th AL | |
| Boston | 1997 | 78-84 | .481 | 4th AL East | -20.0 | 9th AL | |
| Boston | 1998 | 92-70 | .568 | 2nd AL East | -22.0 | 2nd AL | LCle |
| Boston | 1999 | 94-68 | .580 | 2nd AL East | - 4.0 | 4th AL | WCle LNYY |
| Boston | 2000 | 85-77 | .525 | 2nd AL East | - 2.5 | 6th AL | |
| Boston | 2001 | 82-79 | .509 | 2nd AL East | -13.5 | 7th AL | |
| Boston | 2002 | 93-69 | .574 | 2nd AL East | -10.5 | T5th AL | |
| Boston | 2003 | 95-67 | .586 | 2nd AL East | - 6.0 | 3rd AL | WOak LNYY |
| %Boston | 2004 | 98-64 | .605 | 2nd AL East | - 3.0 | 2nd AL | WAna WNYY WStL |
| Boston | 2005 | 95-67 | .586 | 2nd AL East | - 0.0 | T2nd AL | LChW |
| Boston | 2006 | 86-76 | .531 | 3rd AL East | -11.0 | 8th AL | |
| %Boston | 2007 | 96-66 | .593 | 1st AL East | + 2.0 | 1st AL | WLAA WCle WCol |
| Boston | 2008 | 95-67 | .586 | 2nd AL East | - 2.0 | 4th AL | WLAA LTB |
| Boston | 2009 | 95-67 | .586 | 2nd AL East | - 8.0 | 4th AL | LLAA |
| Boston | 2010 | 89-73 | .549 | 3rd AL East | - 7.0 | 5th AL | |
| Boston | 2011 | 90-72 | .556 | 3rd AL East | - 7.0 | 5th AL | |
| Boston | 2012 | 69-93 | .426 | 5th AL East | -26.0 | 12th AL | |
| %Boston | 2013 | 97-65 | .599 | 1st AL East | + 6.0 | 1st AL | bye WTB WDet WStL |
| Boston | 2014 | 71-91 | .438 | 5th AL East | -25.0 | 12th AL | |
| Boston | 2015 | 78-84 | .481 | 5th AL East | -15.0 | 11th AL | |
| Boston | 2016 | 93-69 | .574 | 1st AL East | + 4.0 | 3rd AL | bye LCle |
| Boston | 2017 | 93-69 | .574 | 1st AL East | + 2.0 | 3rd AL | bye LHou |
| %Boston | 2018 | 108-54 | .667 | 1st AL East | + 8.0 | 1st AL | bye WNYY WHou WLAD |
| Boston | 2019 | 84-78 | .519 | 3rd AL East | -19.0 | 7th AL | |
| Boston | 2020 | 24-36 | .400 | 5th AL East | -16.0 | 13th AL | |
| Boston | 2021 | 92-70 | .568 | 2nd AL East | - 8.0 | 4th AL | WNYY WTB LHou |
| Boston | 2022 | 78-84 | .481 | 5th AL East | -21.0 | T9th AL | |
| Boston | 2023 | 78-84 | .481 | 5th AL East | -23.0 | T9th AL | |
| Boston | 2024 | 81-81 | .500 | 3rd AL East | -13.0 | 9th AL |