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This is a list of seasons completed by the Boston Celtics of the National Basketball Association. It documents the team's season-by-season records, including post-season records, and also includes year-end awards won by the team's players and/or coaches.

With 17 NBA Championships, the Celtics have won the most for any NBA franchise, while the 1959-to-1966 domination of the NBA Championship, with eight straight titles, is the longest consecutive championship winning streak of any North American professional sports team to date.

The Celtics are 19–5 in the 7th game of a playoff series, and have never lost a Game 7 in the NBA Finals, with a record of 7–0 in these games. Most of the Finals decided in a 7th game were won at the expense of the Los Angeles Lakers, beating them 4 times.