The Indian Ordnance Factories Service (IOFS) (Hindi: भारतीय आयुध निर्माणी सेवा) is a civil service of the Government of India. IOFS officers are Gazetted (Group A) defence-civilian officers under the Ministry of Defence. They are responsible for the management of the Indian Ordnance Factories, which provide the sinews of self-reliant, indigenous, defence production capabilities of the nation.