Dania rider Iversen showed tremendous bike control to push ahead of Britain's Tai Woffinden (Wielka Brytania), who had put in a superb showing to get to the final race in Terenzano.
Emil Sayfutdinov came third and remains top of the 2013 SGP standings with 107 points to Woffinden's 102.
Matej Zagar also reached the Italian final and ultimately came in fourth position .
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Russia's Sayfutdinov and Woffinden are some way ahead of the rest of the pack in the overall, with Jaraslow Hampel in third on 85 points.
Massive crash between Andrey Kudryashov and David Bellego - European Speedway Championship