For a small city Chiangmai seems to have more than its share of Italian restaurants. I suspect there's at least 20 and that's not counting the Thai wanabees like 13 Coins and the American style Pizza places.
Here's a few photographed in no order.
Buonissimo. This moved to the present location on the east bank of the river about six months ago. The owner used to run the old PumPui Restaurant.