UNUM OMNES – International Council of Catholic Men – is a world-wide organisation having members in 44 countries. It was formed in Lourdes, France, in 1948. The Irish Hierarchy nominated the Knights of St. Columbanus as the Irish representative to Unum Omnes. The organisation has its head office in the Vatican. The current president, Niall M. Kennedy, is a former Supreme Knight of the Knights of St. Columbanus.

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Unum Omnes brings together national organisations of Catholic men committed to the apostolate and dissemination of the Church’s teachings; it fosters contacts between the member associations in order to encourage mutual familiarity and assistance, and to cooperate in the work of evangelisation; it encourages the establishment of new Catholic men’s organisations; it creates and maintains relations with international organisations sharing the same objectives; it speaks out to public opinion and international organisations on the thinking of Catholic men regarding matters of general interest and concern.

The official bodies of Unum Omnes are the General Assembly, which has total authority regarding the management, discipline and control of the Federation; the Council, as the management body comprising the President, Vice President, the General Secretary, the Treasurer and Ecclesiastical Assistant; the Executive Committee, which is responsible for decision-taking and initiatives between General Assemblies, which have to subsequently ratify them. Membership of Unum Omnes is open to national organisations of Catholic men, recognised by the Church authorities, or national associations of men and women, while diocesan Catholic men’s organisations can become associate members.