The 1975–76 Boston Celtics season was their 30th in the National Basketball Association (NBA) and concluded with their 13th championship, defeating the Phoenix Suns in six games in the 1976 NBA Finals to win their 13th NBA Championship. The Celtics also won their division for the 5th consecutive season, and made their 14th finals appearance. This championship would be ranked 11th in the easiest paths to an NBA Finals championship by HoopsHype in 2024 due to the record of the team they played against in the championship match.

Offseason

Draft picks

Roster

Regular season and postseason recap

The Celtics lost Don Chaney to the American Basketball Association before the 1975–76 season. To fill the gap in the backcourt they traded Paul Westphal to the Phoenix Suns for Charlie Scott, who had averaged more than 20 points in each of the previous three seasons. Despite an uncharacteristically weak bench, the Celtics finished in first place in their division and the second best record in the NBA this season. Boston earned a shot at another NBA title by defeating the Buffalo Braves and then the Cleveland Cavaliers in the playoffs. Boston's opponents in the 1976 NBA Finals were the Phoenix Suns, who had posted a 42–40 regular-season record. The Team in Green was the oddsmakers' choice in the contest. The Celtics took the first two games at Boston Garden, but the Suns came back to win games 3 and 4 on their home court. Game 5 ranks among the all-time thrillers in NBA history. The Suns trailed by 5 points with less than a minute left on the clock, but Westphal made up the deficit almost single-handedly, sending the game into a first overtime period, which ended in a tie. John Havlicek's basket with 2 seconds remaining in double overtime gave the Celtics a one-point lead, which Boston stretched to two points after sinking a technical foul. Then the Suns' Garfield Heard hit a last-second basket to send the contest into a third overtime. The longest game in NBA history finally ended, after three extra periods, with the Celtics winning 128–126. Two days later Boston captured yet another NBA championship, the 13th in franchise history.

Season standings

Record vs. opponents

Game log

Playoffs

13,919 15,320 12,079 16,193 15,320 16,261 14,264 12,098 21,564 21,564 12,951 21,564 15,320 15,320 12,284 13,306 15,320 13,306