The 73rd New York Volunteer Infantry Regiment was an infantry regiment of Union Army in the American Civil War. The regiment was organized in New York City in May 1861 as a Zouave regiment, known for its unusual dress and drill style. The uniform worn by this regiment consisted of the New York state jacket, sky blue trousers with a red stripe down the seam, tan gaiters, and a red Zouave fez with a blue tassel. Drawn from the ranks of the city's many volunteer fire companies, the unit was known alternately as the Second Fire Zouaves, after the 11th New York was known as the First Fire Zouaves.