Robert Jefferson Breckinridge, Jr. (September 14, 1833 - March 13, 1915) was a prominent Kentucky politician and a member of the Breckenridge political family. He was the son of Robert Jefferson Breckinridge and brother of William Campbell Preston Breckinridge. He was born in Baltimore, Maryland. He served as a colonel in the Confederate Army in the Civil War. He later represented Kentucky in the First Confederate Congress from 1862 to 1864. After the war he served in a judge. He married Katharine Morrison in 1856.