Phayu was a monarch of Lan Na who reigned from approximately 1337/1345 to 1355/1367. He was the son of Khamfu and was originally known by the name Chao Phayu.
He ascended the throne following the death of his father. According to local legend, his father died after being bitten by a crocodile or a mermaid. The account of his accession is recorded in the Sip-Ha Rajawong Chronicle.