Armando Diaz was a light cruiser of the Condottieri class and the sister-ship of the Luigi Cadorna.

She was built by OTO, La Spezia, and named after Armando Diaz, an Italian Field Marshal of World War I.

During the Spanish Civil War she served in the western Mediterranean and was based at Palma de Mallorca and Melilla.

However, the following month an important supply convoy to Tripoli required her use for cover, in company with the light cruiser Giovanni dalle Bande Nere and some destroyers.

In the course of this operation the ship was torpedoed and sunk by the British submarine HMS Upright off the Kerkennah Islands in the early hours of 25 February.