Donald Clarke Sweeney is a Canadian former ice hockey defenceman who played over 1,100 games in the NHL, most with the Boston Bruins. He ranks among the top ten in many Bruins team statistics, including third overall in total games played. After retiring from hockey following the 2003–04 season, he worked briefly as a broadcaster before rejoining the Bruins as a team executive in 2006. He is currently the general manager of the Bruins, a position he has held since May 2015 after replacing Peter Chiarelli.

He was drafted to the NHL by the Bruins out of high school, 166th overall in the eighth round, but he postponed his NHL career in order to attend college. He played for four years at Harvard University for the Crimson ice hockey team, where he was named an NCAA East All-American and an ECAC First Team All-Star in 1988.

Sweeney made his NHL debut during the 1988–89 season, having spent half of the year with the American Hockey League's Maine Mariners. In the following season, he helped the Bruins in the NHL to win the Prince of Wales Trophy by scoring 6 points in 21 games until they finally lost to the Edmonton Oilers in the Stanley Cup Finals.

Sweeney played a total of 15 seasons and 1,051 games for Boston, being one of just four players—and two defencemen—in team history to play in over 1,000 games. Since July 2006, he has ranked third on the Bruins' all-time games played list, while amongst all-time club defencemen, he ranks tenth in career goals (52), eighth in assists (210) and ninth in points (262).

Sweeney ended his playing career in 2003–04 as a member of the Dallas Stars. He retired with NHL totals of 52 goals and 221 assists for 273 points and 681 penalty minutes in 1,115 career regular season games. He added nine goals and ten assists for 19 points with 81 penalty minutes in 108 career playoff games.

Sweeney took a job in 2005 as assistant dean of admissions at Phillips Academy in Andover, Massachusetts, and was also a studio analyst for Bruins' games on New England Sports Network (NESN).

On June 21, 2006, Sweeney rejoined the Boston Bruins as the team's director of player development, responsible for the scouting of professional league players as well as for tracking the progress of the team's drafted prospects at the AHL, junior and college levels. In July 2010, he was promoted to assistant general manager. In 2011, his name was engraved on the Stanley Cup after the Bruins won their first Stanley Cup in 39 years over the Vancouver Canucks in the Finals.

Following the firing of Peter Chiarelli as Bruins general manager in April 2015, the Bruins named Sweeney as the team's general manager.

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