27 league titles: 2009, 2000, 1999, 1998, 1996, 1978, 1977, 1962, 1961, 1958, 1956, 1953, 1952, 1951, 1950, 1949, 1947, 1943, 1941, 1939, 1938, 1937, 1936, 1932, 1928, 1927, 1923.
Franchise history
Regular-season record. Division finish uses that season's division alignment.
| 2026 | 93 | 68 | 0 | .578 | 2nd AL East | Playoffs2-3 |
| 2025 | 94 | 68 | 0 | .580 | 1st AL East | Playoffs3-4 |
| 2024 | 94 | 68 | 0 | .580 | 1st AL East | Lost final8-6 |
| 2023 | 82 | 80 | 0 | .506 | 4th AL East | — |
| 2022 | 99 | 63 | 0 | .611 | 1st AL East | Playoffs3-6 |
| 2021 | 92 | 70 | 0 | .568 | 3rd AL East | Playoffs0-1 |
| 2020 | 33 | 27 | 0 | .550 | 2nd AL East | Playoffs4-3 |
| 2019 | 103 | 59 | 0 | .636 | 1st AL East | Playoffs5-4 |
| 2018 | 100 | 62 | 0 | .617 | 2nd AL East | Playoffs2-3 |
| 2017 | 91 | 71 | 0 | .562 | 2nd AL East | Playoffs7-6 |
| 2016 | 84 | 78 | 0 | .519 | 4th AL East | — |
| 2015 | 87 | 75 | 0 | .537 | 2nd AL East | Playoffs0-1 |
| 2014 | 84 | 78 | 0 | .519 | 2nd AL East | — |
| 2013 | 85 | 77 | 0 | .525 | 4th AL East | — |
| 2012 | 95 | 67 | 0 | .586 | 1st AL East | Playoffs3-6 |
| 2011 | 97 | 65 | 0 | .599 | 1st AL East | Playoffs2-3 |
| 2010 | 95 | 67 | 0 | .586 | 2nd AL East | Playoffs5-4 |
| 2009 | 103 | 59 | 0 | .636 | 1st AL East | Champions11-4 |
| 2008 | 89 | 73 | 0 | .549 | 3rd AL East | — |
| 2007 | 94 | 68 | 0 | .580 | 2nd AL East | Playoffs1-3 |
| 2006 | 97 | 65 | 0 | .599 | 1st AL East | Playoffs1-3 |
| 2005 | 95 | 67 | 0 | .586 | 2nd AL East | Playoffs2-3 |
| 2004 | 101 | 61 | 0 | .623 | 1st AL East | Playoffs6-5 |
| 2003 | 101 | 61 | 1 | .623 | 1st AL East | Lost final9-8 |
| 2002 | 103 | 58 | 0 | .640 | 1st AL East | Playoffs1-3 |
| 2001 | 95 | 65 | 1 | .593 | 1st AL East | Lost final10-7 |
| 2000 | 87 | 74 | 0 | .540 | 1st AL East | Champions11-5 |
| 1999 | 98 | 64 | 0 | .605 | 1st AL East | Champions11-1 |
| 1998 | 114 | 48 | 0 | .704 | 1st AL East | Champions11-2 |
| 1997 | 96 | 66 | 0 | .593 | 2nd AL East | Playoffs2-3 |
| 1996 | 92 | 70 | 0 | .568 | 1st AL East | Champions11-4 |
| 1995 | 79 | 65 | 1 | .548 | 2nd AL East | Playoffs2-3 |
| 1994 | 70 | 43 | 0 | .619 | 1st AL East | — |
| 1993 | 88 | 74 | 0 | .543 | 2nd AL East | — |
| 1992 | 76 | 86 | 0 | .469 | 5th AL East | — |
| 1991 | 71 | 91 | 0 | .438 | 5th AL East | — |
| 1990 | 67 | 95 | 0 | .414 | 7th AL East | — |
| 1989 | 74 | 87 | 0 | .460 | 5th AL East | — |
| 1988 | 85 | 76 | 0 | .528 | 5th AL East | — |
| 1987 | 89 | 73 | 0 | .549 | 4th AL East | — |
| 1986 | 90 | 72 | 0 | .556 | 2nd AL East | — |
| 1985 | 97 | 64 | 0 | .602 | 2nd AL East | — |
| 1984 | 87 | 75 | 0 | .537 | 3rd AL East | — |
| 1983 | 91 | 71 | 0 | .562 | 3rd AL East | — |
| 1982 | 79 | 83 | 0 | .488 | 5th AL East | — |
| 1981 | 59 | 48 | 0 | .551 | 3rd AL East | Lost final8-6 |
| 1980 | 103 | 59 | 0 | .636 | 1st AL East | Playoffs0-3 |
| 1979 | 89 | 71 | 0 | .556 | 4th AL East | — |
| 1978 | 100 | 63 | 0 | .613 | 1st AL East | Champions7-3 |
| 1977 | 100 | 62 | 0 | .617 | 1st AL East | Champions7-4 |
| 1976 | 97 | 62 | 0 | .610 | 1st AL East | Lost final3-6 |
| 1975 | 83 | 77 | 0 | .519 | 3rd AL East | — |
| 1974 | 89 | 73 | 0 | .549 | 2nd AL East | — |
| 1973 | 80 | 82 | 0 | .494 | 4th AL East | — |
| 1972 | 79 | 76 | 0 | .510 | 4th AL East | — |
| 1971 | 81 | 81 | 0 | .500 | 4th AL East | — |
| 1970 | 93 | 69 | 1 | .574 | 2nd AL East | — |
| 1969 | 80 | 81 | 1 | .497 | 5th AL East | — |
