That compared with 0.5-percent inflation in February.
The cost of living rose by 0.1 percent from the February level, the Istat data agency said, adding that the slowdown was due to prices decreases for energy and food.
The definitive figures confirmed preliminary ones.
Excluding unprocessed food and energy, core inflation was 0.9 percent – 0.1 points lower than in February.
Economists worry that ultra-low inflation could stall the patchy European economic rebound, stifling investment and demand.
The European Central Bank has bristled over calls for it to take action, after deciding in its monthly meeting to hold monetary policy unchanged.
Italy has the third-biggest economy in the eurozone.