James Henry "Jim" Webb, Jr. (born February 9, 1946), is the senior Senator from Virginia. He is also an author and a former Secretary of the Navy under President Ronald Reagan. He is a member of the Democratic Party.

A 1968 graduate of the U.S. Naval Academy, Webb served as a Marine Corps infantry officer until 1972, and is a highly decorated Vietnam War combat veteran. During his four years with the Reagan administration, Webb served as the first Assistant Secretary of Defense for Reserve Affairs, then as Secretary of the Navy.

Webb won the Democratic nomination for the 2006 Virginia Senate race by defeating Harris Miller in the primary, then won the general election by defeating the Republican incumbent George Allen. Webb's thin margin in the general election (less than 0.5%) kept the outcome uncertain for nearly two days after polls closed on November 7, 2006, and provided the final seat that tilted the Senate to Democratic control.