Lan Na, or Lanna, was a kingdom in northern Thailand from the 13th to 18th centuries.
Lanna may also refer to:
- Lanna people, or Northern Thai, an ethnic group native to the former kingdom
- Lanna language, or Northern Thai language, spoken in the area of the former kingdom
- Lanna script, or Tai Tham, a script used for languages of the region
- Northern Thailand, the center of the former kingdom called Lanna