Sailendra (Sanskrit:鄐嗣?鄐耜?鄐兒?鄐舟?鄐?Lord of the Mountain) or officially Sailendravam癟a (Sanskrit: Sailendra dynasty) is the name of an influential Indonesian dynasty that emerged in 8th century Java.

The Sailendras were active promoters of Mahayana Buddhism and covered the Kedu Plain of Central Java with Buddhist monuments, including the world famous Borobudur.

The Sailendras are considered to be a thalassocracy and ruled maritime Southeast Asia, however they also relied on agricultural pursuits through intensive rice cultivation on the Kedu Plain of Central Java. The dynasty appeared to be the ruling family of both the Medang Kingdom of Central Java for some period and Srivijaya in Sumatra.