The 2005–06 Boston Bruins season was their 82nd season of operation. The Bruins slipped to 13th in the Eastern Conference and did not qualify for the playoffs for the first time since 2001.

Off-season

Key dates prior to the start of the season:

Regular season

After Joe Thornton voiced his unhappiness with his contract in Boston in 2005, many teams reportedly sent offers to the Bruins. However, Thornton re-signed with the team on August 11, 2005, on a three-year contract worth US$20 million. On November 30, 2005, he was traded to the San Jose Sharks in a blockbuster four-player deal which sent forwards Marco Sturm and Wayne Primeau and defenseman Brad Stuart to Boston. Thornton was the team's leading scorer at the time by a substantial margin and many felt Bruins general manager Mike O'Connell had traded away one of the few players who was truly showing an exemplary effort. On January 10, 2006, Thornton returned to Boston as a member of the Sharks, but was ejected for checking Bruins' defenseman Hal Gill from behind at 5:13 of the first period. Thornton received a five-minute major and a game misconduct. The misconduct was later rescinded by the NHL. General manager Mike O'Connell was fired on March 25 and replaced on an interim basis by assistant general manager Jeff Gorton. The Bruins ended up finishing with the third-worst record in the Eastern Conference, but the story of the season for the team was the emergence of goaltender Tim Thomas. Thomas had been in the Bruins organization before and had become a star in Europe before deciding to give the NHL one last try. Injuries to incumbent starter Andrew Raycroft and backup Hannu Toivonen pushed Thomas into the starting role, one that he did not relinquish until after the 2011–12 season.

Final standings

Schedule and results

Player statistics

Scoring

Goaltending

Awards and records

Awards

Milestones

Transactions

The Bruins were involved in the following transactions from February 17, 2005, the day after the 2004–05 NHL season was officially cancelled, through June 19, 2006, the day of the deciding game of the 2006 Stanley Cup Finals.

Trades

Players acquired

Players lost

Signings

Draft picks

The 2005 NHL Entry Draft was the 43rd NHL entry draft. As a lockout cancelled the 2004–05 NHL season, the draft order was determined by lottery on July 22, 2005. Teams were assigned 1 to 3 balls based on their playoff appearances and first overall draft picks from the past three years. According to the draft order, the selection worked its way up to 30 as usual; then instead of repeating the order as in past years, the draft "snaked" back down to the team with the first pick. Therefore the team with the first pick overall would not pick again until the 60th pick. The team with the 30th pick would also get the 31st pick. The draft was only seven rounds in length, compared to nine rounds in years past. The labor dispute caused the shortened draft.

Farm teams

The Bruins' American Hockey League (AHL) affiliate was the Providence Bruins. The Bruins had 43 wins and 92 points and finished in fourth place in their division. The Bruins were eliminated in the first round of the playoffs against Portland. Eric Healey and Tim Thomas were selected to the AHL All-Star Game and Healey was the captain for PlanetUSA. Jonathan Sigalet was nominated for the AHL Man of the Year Award.