Carl Jacob Hammarsköld (1833–1884), also known as Charles J. Hammarskold, was a member of the prominent Hammarskjöld family, who in 1850 followed his father to the United States. He became an ironmaster and U.S. Postmaster in North Carolina. When the American Civil War began, he was commissioned in the Confederate States Army, resigning as lieutenant colonel after the Seven Days Battles. Hammarsköld returned to his old homeland in 1863, where he made a successful, albeit short, career as a railwayman, dying at the age of 50.