FUDOSI or FUDOESI (French: Fédération Universelle des Ordres et Sociétés Initiatiques) was a federation of autonomous esoteric or mystical orders and societies, founded on August 14, 1934, in Brussels (Belgium). It was disbanded in 1951 and was opposed by FUDOFSI.
The Latin name of the federation was Federatio Universalis Dirigens Ordines Societatesque Initiationis.
FUDOSI was an attempt to create a federation of mystical orders with the mission "to protect the sacred liturgies, rites and doctrines of the traditional initiatory Orders from being appropriated and profaned by clandestine organizations" (FUDOSI journal, November 1946). One of its leading founders was AMORC (Ancient Mystical Order Rosae Crucis). An AMORC document describes the nature of FUDOSI as follows:
Some persons, whose minds have not as yet received sufficient light, have been wondering why it was necessary to gather in a Universal Federation the Initiatique Orders and Societies, which, in their own field of work, enjoy the most absolute and complete freedom and perfect autonomy and independence. To this query we may reply that, more than in anything else, it is the initiatique work that the greatest vigilance is indispensable and that a strict and active international discipline must be exercised. We must acknowledge and regret, that there exist many false prophets and a number of so-called initiates who use, for selfish and tyrannical purposes of domination, the pretext of initiation to thrust themselves on, and exploit, gullible and sincere persons. It was high time to warn the public against these false leaders and against noxious doctrines which they taught to trusting souls. In each country, each authentic and regular Order knows its imitators and such false prophets. It was necessary to watch these clandestine movements, to expose these impostors or instruments of hidden and unavowed forces, in all countries, wherever they be operating, and thus avoid any confusion between the regular and authentic Orders and false Organizations that are harmful or that give teachings that have nothing to do with the Universal Tradition and Esoterism. And also it was necessary that the authentic Orders be careful in selecting their members and their officers and in maintaining their adepts and students on the right path of the true doctrines, obliging them to follow a strict line of discipline, rational, sincere and conscientious work, so as to avoid radical teachings and heterodoxy. This immense work which was intended to protect the Orders against their inner and outer enemies has been successfully carried on by the F.U.D.O.S.I. and is now going on. ("F.U.D.O.S.I., the." 1946 San Jose, AMORC)