The 9th Army (Italian: 9ª Armata) was a World War I and World War II field army of the Royal Italian Army.

After the Battle of Caporetto (November 1917) the Italian Army was completely reorganized by Armando Diaz.

The new 9th Italian Army was formed under command of Paolo Morrone.

It consisted of: It participated as reserve in the successful battles of the Piave River (June 1918) and Vittorio Veneto (October–November 1918).

It then became the Italian garrison of the occupied or annexed territories of the Kingdom of Albania and the Italian governorate of Montenegro until the Italian surrender in 1943.