Two. They won the 1974 championship against the Milwaukee Bucks and the 1976 championship against the Phoenix Suns.
17 championships
The Celtics have won 17 NBA championships.....
17 Championships.
Celtics-17 championships Lakers-16 championships
Seventeen.
The Boston Celtics have won 17 NBA championships.
17 championships
Boston Celtics have won 17 NBA championships, the most of any NBA team. They won a record eight consecutive championships from 1959-1966.
The Boston Celtics won a record 8 in a row from 1959-1966. They have won a total of 17 NBA Championships.
The Boston Celtics currently have 17 NBA Championships
Three
20