Northern Thai (Thai: ภาษาถิ่นพายัพ; rtgs: Phasa Thin Phayap), Lan Na (Thai: ล้านนา), or Kham Mueang (Northern Thai: ᨣᩴᩤᨾᩮᩥᩬᨦ [kam˧.mɯːəŋ˧], , Thai: คำเมือง [kʰam˧ mɯːəŋ˧]) is the language of the Northern Thai people people of Lan Na, Thailand. It is a Tai language closely related to Thai and Lao.