The 674th Bombardment Squadron is an inactive 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.