The 674th Bombardment Squadron is a former United States Army Air Forces unit. Its last assignment was with the 417th Bombardment Group at Itami Airfield, Japan, where it was inactivated on 5 November 1945. During World War II, the squadron operated in the Southwest Pacific Theater as a light bombardment unit during the New Guinea and Philippines campaigns. It was awarded both the Distinguished Unit Citation and the Philippine Presidential Unit Citation for its combat service.