Lori Ann Trahan is an American businesswoman and politician serving as the U.S. representative for Massachusetts's 3rd congressional district since 2019. The district covers Boston's northwestern suburbs, and includes Lowell, Lawrence, Concord, and Trahan's hometown, Westford. A Democrat, she formerly served as chief of staff to Representative Marty Meehan in Massachusetts's 5th congressional district.

Massachusetts's 3rd congressional district is located in northeastern and central Massachusetts.