Least Crowded Hikes in northern Italy?

Adamello-Brenta and Orobie Bergamasche will give you solitude and empty paths in July. Also some areas of Parco Nazionale dello Stelvio; we hiked part of Alta via Camuna n°2 over a weekend last July, and met only a few people.

If you want a strenuous hike, choose Alta via dell'Adamello - sentiero 1. It's well marked, with overnight in huts, but it's rather hard and the terrain is very rugged - with a wonderful scenery. It's also quite difficult to find description in languages other than Italian - here's a sample:

http://www.parcoadamello.it/public/Sentiero_n.1.pdf

What do you mean with "crowded"?
Outside the popular trails, it's often difficult to meet more than 10 persons per hour.
The last time when I was in the Gran Paradiso Park (on a weekday in early July), I met absolutely no human beeing (but saw many capricorns and sheep) between Valsavarenche (Maisonasse) and Val de Cogne (Valnontey)

Thank you Chiaram. I am limited to short easy/moderate hikes, maybe 8km max from the parking area and about 4 hours duration. But I will definitely check out those you mentioned. I assume Adamello-Brenta and Orobie Bergamasche generally won't be crowded even close to the easy trail start?
Meckerdv- I went to Switzerland last year and I have to say the main paths around the train destinations in Interlaken were pretty crowded. Like Schynige Platte and Jungfrau Joch. My non-crowded idea is to be able to walk for at least 15 minutes or so, without seeing any people at all. That's why I didn't list Tre Cime, as I am under the impression from online reading that it's regularly swamped by tourists. Correct me if I'm wrong.
If anyone has any specific suggestions for easy/short and uncrowded hikes I would greatly appreciate it! Thanks!

You can take also single hikes out of Alta Via dell'Adamello, even reaching some huts from the trailhead is a long and beautiful trek - for example, from Temù/Val d'Avio to Rifugio Garibaldi.

You might find some people during the weekends in July on the most popular paths, but crowds are never a problem.

Thanks. I've seen online that Adamello seems to have gotten a lot of reviews on google, which usually indicates it's popular. I assume its just popular during the winter then? What would be a good jumping off point for Adamello and Del Stelvio? Ponte di Legno?

Yes, it's a hugely popular ski area in winter. The hikes are very popular locally, but never get crowds, unless for some in the two mid weeks of August.

Ponte di Legno is the ideal base; it sits just between Stelvio NP and Adamello-Brenta park. Both protected areas are wide and some areas are pretty wild and seldom visited (for the Alpine/Italian standard, don't expect the wilderness of North America!). For the best known part of Stelvio NP Bormio or Santa Caterina Valfurva could be better; in summer Santa Caterina can be reached by car from Ponte di Legno via Passo Gavia, one of the steepest, most narrow and dangerous roads in the Alps. The pass peaks at over 2600 mt and it's open from June to September.

"Meckerdv- I went to Switzerland last year and I have to say the main paths around the train destinations in Interlaken were pretty crowded"
That's right: the most crowded Swiss hiking trails are around Wengen-Grindelwald, Schynige Platte-Grindelwald, Griesalp - Kandersteg - Gemmi, Adelboden - Lenk, Hohtenn - Brigerbad, Crans/Montana - Bellalui - Violettes Hut, Nendaz - Tracouet - Verbier, Sentier du Tour du Mont Blanc, Walkers Haute Route, Loetschental, Zermatt, Saas Fee, St. Luc - Chandolin - Tignousa, Belalp - Riederalp - Bettmeralp Fiescheralp, Airolo - Cari - Sobrio - Biasca, Engelberg - Truebsee - Melchsee, Flumserberge, Pizol, Flims, Davos - Kosters - Gargellen, Arosa, St. Moritz - Val Fex, St. Moritz - Fuorcla Surlej - Pontresina, Bernina - Poschiavo, Wasserauen - Saentis - Hoher Kasten. The remaining 90 per cent of the Swiss hiking trail network are never crowded (except areas about 1 mile around mountain railway stations or car parkings).

"easy/moderate hikes, maybe 8km max from the parking area and about 4 hours duration" may be a bit difficult to find around Sta Caterina Valfurva. The best hikes go up to the glaciers (like Rifugio Casati), that means about 1500 metres above the village.
You may have a look at the map: http://lombardia.stelviopark.it/portfolio/items/escursione-in-val-zebru/

Thanks for the link. What about Rieserferner-Ahrn park? How busy are those trails typically? More crowded than Dello Stelvio?