William Hayward was an American lawyer and commander of the Harlem Hellfighters during World War I.

The 369th Infantry Regiment, originally formed as the 15th New York National Guard Regiment before it was re-organized as the 369th upon its federalization 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 mainly consisted of African Americans, but it also included men from Puerto Rico, Cuba, Guyana, Liberia, Portugal, Canada, the West Indies, as well as white American officers. With the 370th 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.