- IG Metall
 - Der IG Metall, the German metalworkers union (mostly German language). - International Metalworkers' Federation
- Federation of national unions, representing more than 20 million blue- and white-collar workers in the metal industry in nearly 100 countries.
 Metal Indutries Workers' Union
- Open to all persons locally employed by the metal works related industries in any capacity other than in an executive, managerial, or confidential position.- Metallindustriarbetarförbundet
- Metall, the Swedish Metalworkers Union has about members in the engineering and automobile industry, shipyards, steelworks, workshops, mines, forges, and so on. (In Swedish or English.)
- National Union of Metalworkers of South Africa
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