Massachusetts's 9th congressional district special election of 2001 was held on October 16, 2001 to fill the vacancy caused by the death of Representative Joe Moakley. Democratic State SenatorStephen F. Lynch won the election; defeating six candidates in the Democratic primary and three in the general election.
The Democratic and Republican primaries were held on September 11, 2001. The election was overshadowed by the September 11 attacks, which occurred shortly after polls opened.
Stephen Lynch defeated State Senators Cheryl Jacques, Brian A. Joyce, and Marc R. Pacheco, former federal prosecutor William F. Sinnott, housing advocate John E. Taylor, and activist William A. Ferguson, Jr. for the Democratic nomination.