Arnaldo Berni (2 June 1894 – 3 September 1918) was a decorated Italian Royal Army soldier.

During World War I, Berni was noted for his mountain warfare skills and accomplishments fighting the Austro-Hungarian Army in the Alps.

In early 1915, just before he could take his graduation exam, the army called him to active duty and sent him to the Officers School of Modena.

Promoted to captain, Berni was valued for his knowledge combat techniques at high altitudes.

He served for most of the conflict in charge of putting his driving skills to good use in high mountain clashes.