The Carro Armato M13/40 was an Italian World War II tank designed to replace the M11/39 in the Royal Italian Army at the start of World War II. It was the primary tank used by the Italians throughout the war. The design was influenced by the British Vickers 6-Ton and was based on the modified chassis of the earlier M11/39. Production of the M11/39 was cut short in order to get the M13/40 into production. The name refers to "M" for Medio (medium) according to the Italian tank weight standards at the time, 13 tonnes was the scheduled weight and 1940 the initial year of production.

The Carro Armato M11/39 was an Italian medium tank first produced prior to World War II. The M11/39 saw service in Africa and Italy (1939–1944). The official Italian designation was Carro Armato M11/39. The designation for the M11/39 is as follows: "M" for Medio ("medium"), followed by the weight in tonnes (11) and the year of adoption (1939).