Italian Lang Mo is not the official name of this place but it's more the colloquial name, translating as 'The Italian behind Chiang Mai University', with 'Mo' being an abbreviation of 'Mo Cho' which in turn is an abbreviation for Chiang Mai University (Mahawithayalai Chiang Mai).. ... Oh you're still here? :)
I've seen the sign for this one before, but the main sign on Suthep Road looked so unimpressive that I never really considered checking it out until it was recommended to me. And I have a weak spot for Western food in distinctly non-Western, non-tourist areas so went over to give it a try. It turns out that the place looks and feels far fancier and more professional than I thought: This is a proper Italian restaurant that charges a good deal less than some of the Italians downtown. Some of those downtown Italians are most definitely better and have a more varied menu, but Italian Lang Mo is still pretty good and not expensive. Also the house wine at 50 baht for a good glass is a steal.
Keep in mind that the food is mostly aimed at a Thai clientele. This means that some of the dishes may turn out to be a tad spicier compared to your average Italian.. :-D Prices are moderate, most pasta dishes for example go for 70-80 baht each.
To get there, take Suthep Road driving towards the university. Keep going straight at the Canal Road intersection. A bit further you will see the sign on the left hand side, the restaurant is a couple of meters into a soi on the left.