It was composed of the "Siena", "Acqui" and "Trieste" Divisions and fought in the Greco-Italian War until 23 April 1941, when it had reached the Kalamas river.
On 1 October 1941, the XXX Corps was transferred to Campania where it assumed control of the 1st Infantry Division "Superga" and oversaw the defense of the port of Naples and its coastal sectors.
It remained there until 26 December 1942, when it was transferred to Tunisia where it became responsible for the Sousse - Sfax coastal sector, under command of the German 5th Panzer Army.
On 15 July, the XXX Corps was reformed in Sassari by transformation of the Northern Sardinia Tactical Command.
After the armistice of 8 September and the following evacuation of the German units stationed on the island, the XXX Corps was dissolved on 25 October 1943.