Adoni or Adavani is a city in the Kurnool district in the Indian state of Andhra Pradesh. It is a municipality and the headquarters of Adoni Urban mandal, Adoni Rural mandal which administered under the Adoni revenue division. In the 2011 census of India, Adoni had a population of 166,344, making it the 16th most populous town in the state with an urban agglomeration population of 184,625.

The Adoni fort is central to the town's history. In 1780, an observer wrote,

It is thought to have been founded by Chandra Sen in 1200 BC and later came into the medieval kingdom of Vijayanagara which flourished from the 14th to the 16th centuries. The fort then became the stronghold of the Muslim kings of the Adil Shahi dynasty of Bijapur and Golconda. In 1690 the fort was taken by Aurangzeb then in the late 18th century it came to the Raja of Mysore, Tipu Sultan before it was ceded to the British in 1799. In the 15th century and early to mid 16th century, Adoni was a fort town of the Vijayanagara Empire. It was controlled by the kinsmen of Aliya Rama Raya, a powerful aristocrat of the Vijayanagara Empire.

In 1558, during the decline of the Vijayanagara Empire, control of Adoni came to Ali Adil Shah I (1558–1579), the fifth Sultan of the Bijapur Sultanate. Hamilton, in 1820, stated,

In 1564, the Sultanate of Bijapur lost control of Adoni to Mohammedan rulers.

From 1678 to 1688, rule of Adoni lay with Siddi Masud, a wealthy Habshi (African) from Abyssinia who was a powerful general of Raja Anup Singh of Bikaner, Siddi Masud improved the fort; cleared the surrounding forest; established the townships of Imatiazgadh and Adilabad and constructed the Shahi Jamia Masjid. Siddi Masud was also an avid art collector and a patron of the Kurnool school of painting. In 1688, Adoni was attacked by Firuz Jang, a Mughal general. Siddi Musud surrendered with his courtiers and family.

At the fall of the Mughal Empire, around 1760, Adoni was ruled by governors appointed by the Nizam of Hyderabad, a Mughal splinter clan. One such governor was Salabat Jung, brother of the Nizam. The French supported the appointment. However,

In 1786, Adoni was besieged for one month and then captured by Tipu Sultan of the Kingdom of Mysore of South India. On 4 May 1799, Tipu Sultan died at the hands of the English. On 15 June 1800, Arthur Wellesley, Marquess of Wellington, wrote to the resident at Hyderabad about appropriate reparations to the Nizam for English occupation of Adoni. Adoni became one of twenty taluqs and in 1810, the Adoni and Nagaldinna taluqs were combined. In 1817 Adoni, at the beginning of the Third Anglo-Maratha War, the British raised a new battalion from other nearby regiments. By 1842, the military had left Adoni because of the perception that the area was susceptible to cholera and because of the unfavourable rugged surrounding geography. Under British rule, South India was divided into several administrative districts. Adoni fell into the district of Bellary of Madras presidency. On 29 April 1861, the acting district engineer of Kurnool wrote to the chief secretary to government at Fort St George,