Are there any yoga retreats in Italy?

Yes, there are many to choose from. Any big city has one or more Yoga centres. This site http://www.vacanzeperte.eu/yoga.html has a few proposals for Yoga vacations in various locations.

You can also try doing a google search specifying the location you are most interested in.

Hi,

I do not know much of Yoga being practiced in Italy or not but one of my friends recently came back from a resort in Trentino. Im not sure if it has yoga, but there are plenty of ayurvedic massages and sessions which benefit you from within. Im sure this will help you out. You can refer to the link I got from him. Hope this helps.

There are many health spa's and resorts of that sort all across Italy.

Italians don't practice yoga, it's considered blasphemous.