Note: W = Wins, L = Losses, % = Percentage
| Season | W | L | % | Playoffs | Results |
|---|---|---|---|---|---|
| Boston Celtics | |||||
| 1949-50 | 22 | 46 | .324 | ||
| 1950-51 | 39 | 30 | .565 | Lost Division Semifinals | New York 2, Boston 0 |
| 1951-52 | 39 | 27 | .591 | Lost Division Semifinals | New York 2, Boston 1 |
| 1952-53 | 46 | 25 | .648 | Won Division Semifinals Lost Division Finals |
Boston 3, New York 1 Syracuse 2, Boston 0 |
| 1953-54 | 42 | 30 | .583 | Lost Division Semifinals | Syracuse 2, Boston 0 |
| 1954-55 | 36 | 25 | .500 | Won Division Semifinals Lost Division Finals |
Boston 2, New York 1 Syracuse 3, Boston 1 |
| 1955-56 | 39 | 33 | .542 | Lost Division Semifinals | Syracuse 2, Boston 1 |
| 1956-57 | 44 | 28 | .611 | Won Division Finals Won NBA Finals |
Boston 3, Syracuse 0 Boston 4, St. Louis 3 |
| 1957-58 | 49 | 23 | .681 | Won Division Finals Lost NBA Finals |
Boston 4, Philadelphia 1 St. Louis 4, Boston 2 |
| 1958-59 | 52 | 20 | .722 | Won Division Finals Won NBA Finals |
Boston 4, Syracuse 3 Boston 4, Minneapolis 0 |
| 1959-60 | 59 | 16 | .787 | Won Division Finals Won NBA Finals |
Boston 4, Philadelphia 2 Boston 4, St. Louis 3 |
| 1960-61 | 57 | 22 | .722 | Won Division Finals Won NBA Finals |
Boston 4, Syracuse 1 Boston 4, St. Louis 1 |
| 1961-62 | 60 | 20 | .750 | Won Division Finals Won NBA Finals |
Boston 4, Philadelphia 3 Boston 4, Los Angeles 1 |
| 1962-63 | 58 | 22 | .725 | Won Division Finals Won NBA Finals |
Boston 4, Cincinnati 3 Boston 4, Los Angeles 2 |
| 1963-64 | 59 | 21 | .738 | Won Division Finals Won NBA Finals |
Boston 4, Cincinnati 1 Boston 4, San Francisco 1 |
| 1964-65 | 62 | 18 | .775 | Won Division Finals Won NBA Finals |
Boston 4, Philadelphia 3 Boston 4, Los Angeles 1 |
| 1965-66 | 54 | 26 | .675 | Won Division Semifinals Won Division Finals Won NBA Finals |
Boston 3, Cincinnati 2 Boston 4, Philadelphia 1 Boston 4, Los Angeles 3 |
| 1966-67 | 60 | 21 | .741 | Won Division Semifinals Lost Division Finals |
Boston 3, New York 1 Philadelphia 4, Boston 1 |
| 1967-68 | 60 | 21 | .741 | Won Division Semifinals Won Division Finals Won NBA Finals |
Boston 4, Detroit 2 Boston 4, Philadelphia 3 Boston 4, Los Angeles 2 |
| 1968-69 | 48 | 34 | .585 | Won Division Semifinals Won Division Finals Won NBA Finals |
Boston 4, Philadelphia 1 Boston 4, New York 2 Boston 4, Los Angeles 3 |
| 1969-70 | 34 | 48 | .415 | ||
| 1970-71 | 44 | 38 | .537 | ||
| 1971-72 | 56 | 26 | .683 | Won Conference Semifinals Lost Conference Finals |
Boston 4, Atlanta 2 New York 4, Boston 1 |
| 1972-73 | 68 | 14 | .829 | Won Conference Semifinals Lost Conference Finals |
Boston 4, Atlanta 2 New York 4, Boston 3 |
| 1973-74 | 56 | 26 | .683 | Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 4, Buffalo 2 Boston 4, New York 1 Boston 4, Milwaukee 3 |
| 1974-75 | 60 | 22 | .732 | Won Conference Semifinals Lost Conference Finals |
Boston 4, Houston 1 Washington 4, Boston 2 |
| 1975-76 | 54 | 28 | .659 | Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 4, Buffalo 2 Boston 4, Cleveland 2 Boston 4, Phoenix 2 |
| 1976-77 | 44 | 38 | .537 | Won First Round Lost Conference Semifinals |
Boston 2, San Antonio 0 Philadelphia 4, Boston 3 |
| 1977-78 | 32 | 50 | .390 | ||
| 1978-79 | 29 | 53 | .354 | ||
| 1979-80 | 61 | 21 | .744 | Won Conference Semifinals Lost Conference Finals |
Boston 4, Houston 0 Philadelphia 4, Boston 1 |
| 1980-81 | 62 | 20 | .756 | Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 4, Chicago 0 Boston 4, Philadelphia 3 Boston 4, Houston 2 |
| 1981-82 | 63 | 19 | .768 | Won Conference Semifinals Lost Conference Finals |
Boston 4, Washington 1 Philadelphia 4, Boston 3 |
| 1982-83 | 56 | 26 | .683 | Won First Round Lost Conference Semifinals |
Boston 2, Atlanta 1 Milwaukee 4, Boston 0 |
| 1983-84 | 62 | 20 | .756 | Won First Round Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 3, Washington 1 Boston 4, New York 3 Boston 4, Milwaukee 1 Boston 4, Los Angeles 3 |
| 1984-85 | 63 | 19 | .768 | Won First Round Won Conference Semifinals Won Conference Finals Lost NBA Finals |
Boston 3, Cleveland 1 Boston 4, Detroit 2 Boston 4, Philadelphia 1 LA Lakers 4, Boston 2 |
| 1985-86 | 67 | 15 | .817 | Won First Round Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 3, Chicago 0 Boston 4, Atlanta 1 Boston 4, Milwaukee 0 Boston 4, Houston 2 |
| 1986-87 | 59 | 23 | .720 | Won First Round Won Conference Semifinals Won Conference Finals Lost NBA Finals |
Boston 3, Chicago 0 Boston 4, Milwaukee 3 Boston 4, Detroit 3 LA Lakers 4, Boston 2 |
| 1987-88 | 57 | 25 | .695 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 3, New York 1 Boston 4, Atlanta 3 Detroit 4, Boston 2 |
| 1988-89 | 42 | 40 | .512 | Lost First Round | Detroit 3, Boston 0 |
| 1989-90 | 52 | 30 | .634 | Lost First Round | New York 3, Boston 2 |
| 1990-91 | 56 | 26 | .683 | Won First Round Lost Conference Semifinals |
Boston 3, Indiana 2 Detroit 4, Boston 2 |
| 1991-92 | 51 | 31 | .622 | Won First Round Lost Conference Semifinals |
Boston 3, Indiana 0 Cleveland 4, Boston 3 |
| 1992-93 | 48 | 34 | .585 | Lost First Round | Charlotte 3, Boston 1 |
| 1993-94 | 32 | 50 | .390 | ||
| 1994-95 | 35 | 47 | .427 | Lost First Round | Orlando 3, Boston 1 |
| 1995-96 | 33 | 49 | .402 | ||
| 1996-97 | 15 | 67 | .183 | ||
| 1997-98 | 36 | 46 | .439 | ||
| 1998-99 | 19 | 31 | .380 | ||
| 1999-00 | 35 | 47 | .427 | ||
| 2000-01 | 36 | 46 | .439 | ||
| 2001-02 | 49 | 33 | .598 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 3, Philadelphia 2 Boston 4, Detroit 1 New Jersey 4, Boston 2 |
| 2002-03 | 44 | 38 | .537 | Won First Round Lost Conference Semifinals |
Boston 4, Indiana 2 New Jersey 4, Boston 0 |
| 2003-04 | 36 | 46 | .439 | Lost First Round | Indiana 4, Boston 0 |
| 2004-05 | 45 | 37 | .549 | Lost First Round | Indiana 4, Boston 3 |
| 2005-06 | 33 | 49 | .402 | ||
| 2006-07 | 24 | 58 | .293 | ||
| 2007-08 | 66 | 16 | .805 | Won First Round Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 4, Atlanta 3 Boston 4, Cleveland 3 Boston 4, Detroit 2 Boston 4, LA Lakers 2 |
| 2008-09 | 62 | 20 | .756 | Won First Round Lost Conference Semifinals |
Boston 4, Chicago 3 Orlando 4, Boston 3 |
| 2009-10 | 50 | 32 | .610 | Won First Round Won Conference Semifinals Won Conference Finals Lost NBA Finals |
Boston 4, Miami 1 Boston 4, Cleveland 2 Boston 4, Orlando 2 LA Lakers 4, Boston 3 |
| 2010-11 | 56 | 26 | .683 | Won First Round Lost Conference Semifinals |
Boston 4, New York 0 Miami 4, Boston 1 |
| 2011-12 | 39 | 27 | .591 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 4, Atlanta 2 Boston 4, Philadelphia 3 Miami 4, Boston 3 |
| 2012-13 | 41 | 40 | .506 | Lost First Round | New York 4, Boston 2 |
| 2013-14 | 25 | 57 | .305 | ||
| 2014-15 | 40 | 42 | .488 | Lost First Round | Cleveland 4, Boston 0 |
| 2015-16 | 48 | 34 | .585 | Lost First Round | Atlanta 4, Boston 2 |
| 2016-17 | 53 | 29 | .646 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 4, Chicago 2 Boston 4, Washington 3 Cleveland 4, Boston 1 |
| 2017-18 | 55 | 27 | .671 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 4, Milwaukee 3 Boston 4, Philadelphia 1 Cleveland 4, Boston 3 |
| 2018-19 | 49 | 33 | .598 | Won First Round Lost Conference Semifinals |
Boston 4, Indiana 0 Milwaukee 4, Boston 1 |
| 2019-20 | 48 | 23 | .676 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 4, Philadelphia 0 Boston 4, Toronto 3 Miami 4, Boston 2 |
| 2020-21 | 36 | 36 | .500 | Won Play-in game for No. 7 seed Lost First Round |
Boston 118, Washington 100 Brooklyn 4, Boston 1 |
| 2021-22 | 51 | 31 | .622 | Won First Round Won Conference Semifinals Won Conference Finals Lost NBA Finals |
Boston 4, Brooklyn 0 Boston 4, Milwaukee 3 Boston 4, Miami 3 Golden State 4, Boston 2 |
| 2022-23 | 57 | 25 | .695 | Won First Round Won Conference Semifinals Lost Conference Finals |
Boston 4, Atlanta 2 Boston 4, Philadelphia 3 Miami 4, Boston 3 |
| 2023-24 | 64 | 18 | .780 | Won First Round Won Conference Semifinals Won Conference Finals Won NBA Finals |
Boston 4, Miami 1 Boston 4, Cleveland 1 Boston 4, Indiana 0 Boston 4, Dallas 1 |
| 2024-25 | 61 | 21 | .744 | Won First Round Lost Conference Semifinals |
Boston 4, Orlando 1 New York 4, Boston 2 |
| Totals | 3695 | 2501 | .596 | ||
| Playoffs | 364 | 272 | .572 | 18 Championships | |