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Chao (Thai: เจ้า) is a title of the Lan Na royal family members.
Chao Har Kan
Chao Har Kan (เจ้าห้าขัน, lit. 'five lords') is the style for high-ranking royalty in each Lan Na state.
After the fall of the absolute monarchy, the Chao har kan system was abolished by the People's Party (Khana Ratsadon - คณะราษฎร). Today, all of the Chao family use na Chiangmai, na Lamphun, and na Lampang as their surname.
- Chao Luang (เจ้าหลวง) - The ruler of state. The ruler of Chiang Mai is the highest post in the five Lan Na states.
- Chao Uparaja (เจ้าอุปราช) - The viceroy of state.
- Chao Rajawong (เจ้าราชวงศ์) - Son of Chao Luang.
- Chao Burirat (เจ้าบุรีรัตน์) - Son of Chao Luang.
- Chao Rajabute (เจ้าราชบุตร) - Son of Chao Luang.