Robert Laurence "Bob" Barr, Jr. (born November 5, 1948) is a former federal prosecutor and a former member of the United States House of Representatives. He represented Georgia's 7th congressional district as a Republican from 1995 to 2003. He was the Libertarian Party nominee for President of the United States in the 2008 election.

Barr attained national prominence as one of the leaders of the impeachment of President Bill Clinton. Barr joined the Libertarian Party in 2006, and served on its National Committee.

Barr was born on November 5, 1948, in Iowa City, Iowa to Bob and Beatrice Barr. His father, a West Point soldier, moved the family to various locations around the world while pursuing his career in civil engineering. The second of six children, Bob Jr. spent his boyhood in Malaysia, Pakistan, Panama, Peru, Baghdad in Iraq, and finally Tehran, Iran where he graduated from Community High School in 1966.