The 369th Infantry Regiment, formerly known as the 15th New York National Guard Regiment and commonly referred to as the Harlem Hellfighters, was an infantry regiment of the New York Army National Guard during World War I and World War II. The Regiment consisted mainly of African Americans, though it also included several Puerto Rican Americans during World War II. With the 369th Infantry Regiment, it was known for being one of the first African American regiments to serve with the American Expeditionary Forces during World War I.