The Vijayanagara Empire (Kannada: ವಿಜಯನಗರ ಸಾಮ್ರಾಜ್ಯ, Vijayanagara Sāmrājya; Telugu: విజయనగర సామ్రాజ్యము, Vijayanagara Sāmrājyamu), referred to as the Kingdom of Bisnaga by the Portuguese, was a empire based in South India, in the Deccan Plateau region. It was established in 1336 by Harihara I and his brother Bukka Raya I. The empire rose to prominence as a culmination of attempts by the southern powers to ward off Islamic invasions by the end of the 13th century. It lasted until 1646 although its power declined after a major military defeat in 1565 by the Deccan sultanates. The empire is named after its capital city of Vijayanagara, whose ruins surround present day Hampi, now a World Heritage Site in Karnataka, India. The writings of medieval European travelers such as Domingo Paes, Fernão Nunes and Niccolò Da Conti, and the literature in local languages provide crucial information about its history. Archaeological excavations at Vijayanagara have revealed the empire's power and wealth.

Vijayanagara (Kannada: ವಿಜಯನಗರ) is in Bellary District, northern Karnataka. It is the name of the now-ruined capital city that surrounds modern-day Hampi, of the historic Vijayanagara empire which extended over the southern part of India.

In around 1500 Vijaynagar had 500,000 inhabitants, making it the second-largest city in the world after Peking-Beijing and more than twice the size of the biggest European city, Paris. The ruins are now a World Heritage Site.

Most of the city lies on the south bank of the Tungabhadra River. The city was built around the original religious centre of the Virupaksha temple at Hampi. Other holy places lie within its environs, including the site of what is said to be Kishkindha where a Hanuman temple, the cave home of Anjana, Kesari and Shabari, a holy pond named the Pampasarovar are located. It also contains the cave home of Sugriva, the monkey king of the Ramayana.

The city at its greatest extent was considerably larger than the area described here; an account is given at the article on the Vijayanagara metropolitan area. The central areas of the city, which include what are now called the Royal Centre and the Sacred Centre, extend over an area of at least 40 km². It includes the modern village of Hampi. Another village, Kamalapura, lies just outside the old walled city, but is also surrounded by ruins and monuments. The nearest town and railway is in Hosapete, about 13 km (8.1 mi) away by road. Hosapete also lies within the original extents of the old city, though most of the items of interest are within walking distance of Hampi and Kamalapura.