| 68 | 17 | 79% |
| Seasons | Championships | Playoff Percentage |
1957, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1968, 1969, 1974, 1976, 1981, 1984, 1986, 2008
The Boston Celtics have played a total of 68 seasons. Their first season was in 1951, and their most recent season was in 2018.
The Boston Celtics last made the playoffs in 2018, when they lost the Eastern Conference Finals. They've been in the playoffs a total of 54 times in their 68 seasons.
The Boston Celtics have won the NBA Finals 17 times, in 1957, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1968, 1969, 1974, 1976, 1981, 1984, 1986 and 2008.
| Year | Result |
|---|---|
| 2018 | Lost Eastern Conference Finals (Won 2 Rounds) |
| 2017 | Lost Eastern Conference Finals (Won 2 Rounds) |
| 2016 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 2015 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 2014 | Missed Playoffs |
| 2013 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 2012 | Lost Eastern Conference Finals (Won 2 Rounds) |
| 2011 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 2010 | Lost Finals (Won 3 Rounds) |
| 2009 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 2008 | Won Finals |
| 2007 | Missed Playoffs |
| 2006 | Missed Playoffs |
| 2005 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 2004 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 2003 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 2002 | Lost Eastern Conference Finals (Won 2 Rounds) |
| 2001 | Missed Playoffs |
| 2000 | Missed Playoffs |
| 1999 | Missed Playoffs |
| 1998 | Missed Playoffs |
| 1997 | Missed Playoffs |
| 1996 | Missed Playoffs |
| 1995 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 1994 | Missed Playoffs |
| 1993 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 1992 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 1991 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 1990 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 1989 | Lost Eastern Conference First Round (Won 0 Rounds) |
| 1988 | Lost Eastern Conference Finals (Won 2 Rounds) |
| 1987 | Lost Finals (Won 3 Rounds) |
| 1986 | Won Finals |
| 1985 | Lost Finals (Won 3 Rounds) |
| 1984 | Won Finals |
| 1983 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 1982 | Lost Eastern Conference Finals (Won 1 Round) |
| 1981 | Won Finals |
| 1980 | Lost Eastern Conference Finals (Won 1 Round) |
| 1979 | Missed Playoffs |
| 1978 | Missed Playoffs |
| 1977 | Lost Eastern Conference Semifinals (Won 1 Round) |
| 1976 | Won Finals |
| 1975 | Lost Eastern Conference Finals (Won 1 Round) |
| 1974 | Won Finals |
| 1973 | Lost Eastern Conference Finals (Won 1 Round) |
| 1972 | Lost Eastern Conference Finals (Won 1 Round) |
| 1971 | Missed Playoffs |
| 1970 | Missed Playoffs |
| 1969 | Won Finals |
| 1968 | Won Finals |
| 1967 | Lost Eastern Division Finals (Won 1 Round) |
| 1966 | Won Finals |
| 1965 | Won Finals |
| 1964 | Won Finals |
| 1963 | Won Finals |
| 1962 | Won Finals |
| 1961 | Won Finals |
| 1960 | Won Finals |
| 1959 | Won Finals |
| 1958 | Lost Finals (Won 1 Round) |
| 1957 | Won Finals |
| 1956 | Lost Eastern Division Semifinals (Won 0 Rounds) |
| 1955 | Lost Eastern Division Finals (Won 1 Round) |
| 1954 | Lost Eastern Division Finals (Won 0 Rounds) |
| 1953 | Lost Eastern Division Finals (Won 1 Round) |
| 1952 | Lost Eastern Division Semifinals (Won 0 Rounds) |
| 1951 | Lost Eastern Division Semifinals (Won 0 Rounds) |
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