The 4729th Air Defense Group is a discontinued United States Air Force organization. Its last assignment was with the Boston Air Defense Sector at Westover Air Force Base, Massachusetts, where it was discontinued in 1958. The group was formed to provide a single command and support organization for the two fighter interceptor squadrons of Air Defense Command (ADC), that were tenants at Westover, a Strategic Air Command (SAC) base. It was also assigned a maintenance squadron to perform aircraft maintenance. It was discontinued after the 324th Fighter-Interceptor Squadron moved in 1958, leaving only a single fighter squadron at Westover.