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The people of Northern Thailand speak their own dialect of Thai called Kham Meaung or Kham Muang; à¸à¸³à¹à¸¡à¸·à¸à¸, however standard Thai is widely understood. In addition, the hill tribes speak their own languages.
Here and there, especially at temples, you may spot signs written in a curious rounded script that looks more like Burmese than Thai. This is Lanna, the ancient script of the Lanna kingdom, and while very few people can read or write it anymore, it's still popular in ceremonial usage.