The Italian Federation of Metalworkers (Italian: Federazione Impiegati Operai Metallurgici, FIOM) is a trade union representing workers in the metal and engineering industries in Italy.

The union was founded at a conference in Livorno, on 16 June 1901.

In 1906, it was a founding affiliate of the General Confederation of Labour.

In 1919, the union signed an agreement limiting working hours to a maximum of 48 a week.

[1] The union was re-established in 1944, and affiliated to the new Italian General Confederation of Labour.