Question: when was the last time the celtics won a championship
Answer: -- 18 Boston Celtics season Conference Eastern Division Atlantic Founded 1946 History Boston Celtics 1946 -- present Arena TD Garden Location Boston , Massachusetts Team colors Green , black , gold President Rich Gotham General manager Danny Ainge Head coach Brad Stevens Ownership Boston Basketball Partners ( Wyc Grousbeck , CEO and governor ) Affiliation ( s ) Maine Red Claws Championships 17 ( 1957 , 1959 , 1960 , 1961 , 1962 , 1963 , 1964 , 1965 , 1966 , 1968 , 1969 , 1974 , 1976 , 1981 , 1984 , 1986 , 2008 ) Conference titles 21 ( 1957 , 1958 , 1959 , 1960 , 1961 , 1962 , 1963 , 1964 , 1965 , 1966 , 1968 , 1969 , 1974 , 1976 , 1981 , 1984 , 1985 , 1986 , 1987 , 2008 , 2010 ) Division titles 22 ( 1972 , 1973 , 1974 , 1975 , 1976 , 1980 , 1981 , 1982 , 1984 , 1985 , 1986 , 1987 , 1988 , 1991 , 1992 , 2005 , 2008 , 2009 , 2010 , 2011 , 2012 , 2017 ) Retired numbers 21 ( 00 , 1 , 2 , 3 , 6 , 10 , 14 , 15 , 16 , 17 , 18 , 19 , 21 , 22 , 23 , 24 , 25 , 31 , 32 , 33 , 35 , LOSCY ) Website www.