The1973NBA World Championship Series was the championship series of the1972–73 National Basketball Association (NBA) season, and the culmination of that season'splayoffs. TheEastern Conference championNew York Knicks defeated theWestern Conference championLos Angeles Lakers 4 games to 1 to win their second championship. The series was an exact reversal of the prior year, this time with the Lakers winning Game 1 and the Knicks taking the next four games. Knicks centerWillis Reed was named as theNBA Finals MVP.

The Los Angeles Lakers entered the1973 NBA Playoffs as co-favorites in the West with theMilwaukee Bucks, but both teams faced inspired opponents in the first round. TheChicago Bulls gave the Lakers all they could handle before the Lakers came from behind in Game 7 to take the series. The Lakers next faced theGolden State Warriors for the Western Conference championship (the Warriors had upset the Bucks in six games). In Game 1, the Lakers won by 2, and in Game 2 the Lakers won by 10. In Game 3 at Oakland, the Lakers routed the Warriors 126–70, but the Warriors won Game 4 to send the series back to Los Angeles. In the Forum, the Lakers took Game 5 and advanced to their fifth NBA Finals series in six seasons.

One year after their NBA Finals loss, the Knicks were back in the playoffs. For some of the Knicks, includingJerry Lucas andEarl Monroe, this was probably their last shot at an NBA title. In the first round they paired against theBaltimore Bullets. The Knicks won games 1 and 2 in New York, but lost Game 3 at Baltimore (in that game, the Bullets used a strange lineup of two centers and three guards). New York would take Games 4 and 5 andWalt Frazier averaged 20 points per game in this series. In the Conference Finals, the Knicks faced the 68–14Boston Celtics, who not only had the league's best record but also, to that point, the third-best won-lost record in NBA history. The Celtics routed New York, 134–108, Game 1 at theBoston Garden, but the Knicks returned the favor with a 129–96 rout in Game 2 atMadison Square Garden. The Knicks then beat the Celtics in Game 3 in Boston, and took a 3–1 series lead with a double overtime Easter Sunday win back in New York. Boston came back with two critical wins, winning 98–97 in Boston on two Paul Silas free throws, then regaining the home-court advantage with a 110–100 win at New York in Game 6. For Game 7, however, the Celtics were without their starJohn Havlicek, who was nursing an elbow injury. In that Game 7, played in Boston, the Celtics unbeaten record in seventh games played in Boston Garden was snapped when New York won easily, 94–78.

After losing the first game, the Knicks reeled off four straight wins to reclaim the NBA title. This is the Knicks' most recent NBA Championship to date. New York would not make it back to the NBA Finals until1994.

This would also be the last Finals appearance of the decade for the Lakers. Their next appearance would be in1980, which would be the first of nine Finals appearances in 12 years for the franchise.

Knicks win series 4-1

This was the only NBA Championship forJerry Lucas andEarl Monroe.

Game 5 of the series was Wilt Chamberlain's last game played in the NBA. Chamberlain scored the last points of the game, and of his career, on an uncontested fast break dunk with one second remaining.

ABC televised its last NBA Finals, until2003. This is, to date, the last time a New York/Los Angeles NBA Finals of any combination has taken place, as well as the fifth-to-last championship series contested by both cities in any sport (the1981 World Series is the last matchup in the 20th century, and the2024 World Series is the latest).

• 1972–73 NBA season
• 1973 NBA Playoffs

• NBA History