The Shailendra dynasty (, ʃaɪlenˈdraː derived from Sanskrit combined words Śaila and Indra, meaning "King of the Mountain", also spelled Sailendra, Syailendra or Selendra) was the name of a notable Indianised dynasty that emerged in 8th-century Java, whose reign signified a cultural renaissance in the region. The Shailendras were active promoters of Mahayana Buddhism and covered the Kedu Plain of Central Java with Buddhist monuments, one of which is the colossal stupa of Borobudur, now a UNESCO World Heritage Site.
The Shailendras are considered to have been a thalassocracy and ruled vast swathes of maritime Southeast Asia, however they also relied on agricultural pursuits, by way of intensive rice cultivation on the Kedu Plain of Central Java. The dynasty appeared to be the ruling family of both the Mataram Kingdom of Central Java, for some period, and the Srivijaya Kingdom in Sumatra.
The inscriptions created by Shailendras use three languages; Old Malay, Old Javanese, and Sanskrit — written either in the Kawi alphabet, or pre-Nāgarī script. The use of Old Malay has sparked speculation of a Sumatran origin, or Srivijayan connection of this family. On the other hand, the use of Old Javanese suggests their firm political establishment on Java. The use of Sanskrit usually indicates the official nature, and/or religious significance, of the event described in any given inscription.
The Sojomerto inscription (c. 725) discovered in Batang Regency, Central Java, mentioned the name Dapunta Selendra and Selendranamah. The name 'Selendra' was another spelling of Shailendra, suggested that Dapunta Selendra was the progenitor of Shailendra family in Central Java. The inscription is Shaivist in nature, which suggests that the family was probably initially Hindu Shaivist before converting to Mahayana Buddhism.
The earliest dated inscription in Indonesia in which clearly mentioned the dynastic name of as appears is the Kalasan inscription (778) of central Java, which mention its ruler Mahārāja dyāḥ Pañcapaṇa kariyāna Paṇaṃkaraṇa and commemorates the establishment of a Buddhist shrine, Candi Kalasan, dedicated for the goddess Tara.