Hayam Wuruk, also called (after 1350) Rajasanagara, Pa-ta-na-pa-na-wu, or Bhatara Prabhu, (1334–1389), was a Javanese King from the Rajasa Dynasty and the fourth monarch of the Majapahit Empire. Together with his prime minister Gajah Mada, he reigned the empire at the time of its greatest power. He was preceded by Tribhuwana Wijayatunggadewi and succeeded by his son-in-law Wikramawardhana. Most of the accounts of his life were taken from Nagarakretagama and Pararaton.

According to Nagarakretagama canto 1 stanza 4 and 5 (composed by Mpu Prapanca in 1365), Hayam Wuruk was born in 1256 Saka or correspond to 1334 CE, the same year that Mount Kelud erupted. Prapanca argued that this was the divine sign that Batara Gurunata (Javanese name for Shiva Mahadewa) has manifest Himself on earth, reincarnated as the Javanese king. Also in the same, Gajah Mada declared his oath Sumpah Palapa.

Hayam Wuruk's name can be translated as "scholar rooster". He was the son of Tribhuwana Tunggadewi and Sri Kertawardhana or Cakradhara. His mother was the daughter of Raden Wijaya founder of Majapahit, meanwhile his father was the son of Bhre Tumapel lesser king of Singhasari. Both Pararaton and Nagarakretagama praised Hayam Wuruk as a handsome, bright, talented, and exceptional student in the courtly martial arts of archery and fencing, also mastering politics and scriptures, as well as arts and music. He was known as an accomplished ceremonial dancer in the court. Some accounts tell of Hayam Wuruk's performances in a traditional ceremonial Javanese mask dance. His mother, Queen Tribhuwana, educated and groomed him to become the next monarch of Majapahit.

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