FS Class E.333 was a class of electric locomotives of the Ferrovie dello Stato (FS), powered by three-phase alternating current, which were in service from 1923 to 1968. They were designed by Kálmán Kandó for hauling fast passenger trains. Having the same electrical equipment as the FS Class E.552 locomotives, they presented the same defects and had to be modified. After modification, they were able to carry out the services for which they were designed.