| Rajadhiraja | |
| Succession: | Vijayanagara Emperor |
| Predecessor: | Achyuta Deva Raya |
| Regent: | Rama Raya |
| Successor: | Tirumala Deva Raya |
| Birth Date: | Unknown |
| Birth Place: | Vijayanagara, Vijayanagara Empire (modern day Hampi, Karnataka, India) |
| Religion: | Hinduism |
Sadasiva Raya (r. 1542–1570 CE) was an Emperor of Vijayanagara who reigned from 1542 to 1570 CE.[1] When the Vijayanagara Emperor Achyuta Raya died in 1542 CE, his son, Venkata I (Venkata Raya or Venkatadri Raya), succeeded him. However, Venkata I was assassinated six months later. Sadasiva Raya, who was the nephew (sister-in-law's son) of Achyuta Raya, became the new Emperor in accordance with the Aliya succession laws prevalent among the Tuluvas. Sadasiva Raya, along with his Prime Minister Rama Raya, restored the Vijayanagara empire's power, which had diminished after the reign of Krishna Deva Raya. The strategy was to play the Turko-Persian Sultanates in the Deccan against each other by first allying with one and then the other.[2]