The 31st Infantry Division "Calabria" (Italian: 31ª Divisione di fanteria "Calabria") was an infantry division of the Royal Italian Army during World War II. The Calabria was formed in Sassari and named for the region of Calabria. The division was part of the garrison of Sardinia, where it remained until the Armistice of Cassibile, after which it served in the Italian Co-belligerent Army.