Hayam Wuruk, also called (after 1350) Rajasanagara, Pa-ta-na-pa-na-wu, or Bhatara Prabhu, (1334–1389), is a Javanese King from the Rajasa Dynasty and the fourth monarch of the Majapahit Empire.

Together with his prime minister Gajah Mada, he reigns over the empire at the time of its greatest power.

He had been preceded by Tribhuwana Wijayatunggadewi and is succeeded by his son-in-law Wikramawardhana.

Most of the accounts of his life are taken from Nagarakretagama and Pararaton.