The 39th New York Infantry Regiment, known as the "Garibaldi Guard" after the Italian revolutionary, Giuseppe Garibaldi, was an infantry regiment that served in the Union Army during the American Civil War.

Frederick George D'Utassy or George Frederick D'Utassy was an officer in the Union Army in the American Civil War who led the famous Garibaldi Guard, or 39th New York Volunteer Infantry Regiment, from 1861 to 1863. The flamboyant Hungarian Colonel was court-martialed in 1863 for fraud and conduct prejudicial to military discipline.