1946 1957 1957 – 1960 1961 – 1963 1964 – 1966 1968 – 1974 1978 1981 – 1986 1995 2008 Boston Celtics Team Formation The Boston Celtics were formed on June 6, 1946, by Boston Garden-Arena Corporation President Walter A. Brown as a team in the Basketball Association of America, and became part of the National Basketball Association after the …