1984 NBA Finals

In the 1983–84 season, the Celtics won 62 games to lead the league. The Celtics were led by Bird, who won his first MVP award, and was complemented by 1981 Finals MVP Cedric Maxwell, first-time all-star and Sixth Man Award winner Kevin McHale, Robert Parish, Gerald Henderson and Danny Ainge. Boston's most crucial addition was Dennis Johnson, whom they acquired from the Phoenix Suns in the offseason in hopes of addressing their porous back-court defense.

In the playoffs, the Celtics defeated the Washington Bullets in four, the New York Knicks in seven, and the Milwaukee Bucks in five.

The Lakers were coming off a four-game sweep by the Philadelphia 76ers in the previous year's finals. Before the season began, the Lakers traded long-time guard Norm Nixon to the San Diego Clippers in exchange for the draft rights to Byron Scott. The trade signaled a transition period, as some of the key players from the first two championships gave way to younger talent. Despite the changes, it did not stop the Lakers from finishing with the best record (54–28) in the Western Conference, powered by their one-two punch of Kareem Abdul-Jabbar and Magic Johnson.

During the playoffs, the Lakers defeated the Kansas City Kings in three, the Dallas Mavericks in five, and the Phoenix Suns in six. However, the Lakers suffered a key injury when their 3rd leading scorer, Jamaal Wilkes (17 PPG) was ruled out of the finals. This cost the Lakers valuable depth, as James Worthy, a key contributor off the bench, would now have to start in Wilkes' place.

The Los Angeles Lakers won both games in the regular season series:

The Lakers opened the series with a 115-109 victory at Boston Garden.

In Game 2, the Lakers led 113-111 with 18 seconds left when Gerald Henderson stole a James Worthy pass to score a game tying layup. The Lakers then inbounded the ball and Magic Johnson inexplicably dribbled the clock out during regulation time. The Celtics eventually prevailed in overtime 124-121, thanks to Scott Wedman's game-winning shot from the baseline with 14 ticks left.

In Game 3, the Lakers raced to an easy 137-104 victory as Magic Johnson dished out 21 assists, an NBA Finals record. After the game, Larry Bird said his team played like "sissies" in an attempt to light a fire under his teammates. It was Boston's worst playoff defeat in franchise history to that date.

In Game 4, the Lakers had a five-point game lead with less than a minute to play, but made several execution errors, including Magic Johnson's bad pass to Robert Parish late in the fourth quarter, and missing two crucial free throws in OT as the Celtics tied the game and then came away with a 129-125 victory in overtime. Johnson was called "Tragic Johnson" by Celtics fans due to the two crucial errors he committed in Game 4 (the Parish steal, followed by two botched free throws in OT). The Lakers took an early lead in overtime, but a controversial foul call foul on Kareem Abdul-Jabbar, with 16 seconds remaining in regulation, had been his 6th foul, and he was out of the game. The Laker momentum was stalled, and Larry Bird came up with a crucial jumper over Magic Johnson with 16 seconds remaining in overtime, then M.L. Carr stole James Worthy's inbounds pass followed by a dunk to seal the win. The game was also marked by Celtic forward Kevin McHale's clothesline take-down of Laker forward Kurt Rambis on a breakaway layup which triggered the physical aspect of the rivalry. Larry Bird would go after Kareem Abdul-Jabbar later on in the third quarter, and 1981 Finals MVP Cedric Maxwell further antagonized the Lakers by following a missed James Worthy free throw by crossing the lane with his hands around his own neck, symbolizing that Worthy was "choking" under pressure. Also, Bird pushed Michael Cooper to the baseline following the inbound play during the second quarter.

Game 4 of the 1984 Finals marked the last Finals game to go into overtime until Game 2 of the 1990 NBA Finals.

In Game 5, the Celtics took a 3-2 series lead with a 121-103 victory, as Larry Bird scored 34 points and grabbed 17 rebounds. The game was known as the "Heat Game", as it was played under 97 °F (36 °C) heat, and without any air conditioning, at Boston Garden. The Celtics did not warm up with their sweat pants on because of extreme heat, and an oxygen tank was provided to give air to an aging Kareem Abdul-Jabbar. Referee Hugh Evans became dehydrated and fainted at one point in the first half. He worked the first half, but was replaced by John Vanak for the second half.[2] It was also the last time that a team with home court advantage in the NBA finals played Game 5 on its own floor until 2014. The next year, the NBA Finals switched to the 2-3-2 format with Game 5 going to the team without home-court advantage, which continued through 2013.

In Game 6, the Lakers evened the series with a 119-108 victory. In the game the Lakers answered the Celtics' rough tactics when Laker forward James Worthy shoved Cedric Maxwell into a basket support. After the game a Laker fan threw a beer at Celtics guard M.L. Carr as he left the floor, causing him to label the series "all-out-war."

In Game 7, the heat that was an issue in Game 5 was not as bad (indoor temperatures hovered around 91 °F (33 °C) during the game, due to additional fans being brought in to try to cool the air). The Celtics were led by Cedric Maxwell who had 24 points, eight rebounds and eight assists as they came away with a 111-102 victory. In the game, the Lakers rallied to cut a 14-point-deficit to three with one minute remaining when Cedric Maxwell knocked the ball away from Magic Johnson. Dennis Johnson responded by sinking two free throws to seal the victory. Larry Bird was named MVP of the series.

The series was the eighth time in NBA history that the Celtics and Lakers met in the NBA finals, with Boston winning each time, and the first championship that the Celtics claimed at home since 1966.