Stephen F. Lynch (born March 31, 1955) is an American politician who has served as a member of the U.S. House of Representatives from Massachusetts since 2001. He is a Democrat representing the state's 8th district, which includes the southern fourth of Boston and many of its southern suburbs. Lynch was previously an ironworker and lawyer, and served in both chambers of the Massachusetts General Court.

Lynch, the fourth of six children, was born March 31, 1955, in the neighborhood of South Boston. He was raised with his five sisters in the Old Colony Housing Project. His father, Francis Lynch, was an ironworker who had dropped out of school in the eighth grade. His mother, Anne (née Havlin), was a night-shift post office worker.