A global union federation (GUF) is an international of national trade unions organising in specific industry sectors or occupational groups. A GUF used to be known as an international trade secretariat (ITS).
Many unions are members of one or more global union federations, relevant to the sectors where they have their members. Individual unions may also be affiliated to a national trade union center, which in turn can be affiliated to the International Trade Union Confederation (ITUC) or the World Federation of Trade Unions (WFTU).