Looks like the last thread on this was 10 years ago (!). Will be in Milan and Turin soon. The Baladin pub in Turin is currently my only must-go for beer. What else should be on my list?
In Milan, Birrificio Lambrate, LambicZoon and the tap room of Birrificio Italiano close to the Central Station. By train, you can easily go to Carrobbiolo Brewpub in Monza. By car, Menaresta and War (in the surroundings of Milan). In Turin, Edit and Dogana. By car, Loverbeer in the surroundings of Turin, famous for barrel aged beers.
Good Beer Drinking (Bere Buona Birra) is another great stop and close to LambicZoon. We always hop from one to the other when we are in town.