Airlangga (also spelled Erlangga), regnal name Rakai Halu Sri Lokeswara Dharmawangsa Airlangga Anantawikramottunggadewa (born 991 in Bali, Indonesia – died 1049 in Java), is the only raja of the Kingdom of Kahuripan.

The Kingdom is built from the territory of the Kingdom of Medang after Medang is sacked by king Wurawari of Lwaram.

He gradually gains support, wins back the kingdom once ruled by his uncle, and goes on to become one of Java's most notable kings.

Airlangga means "jumping water", thus his name means "he who crossed the water", described by his life story: born in the court of Bali, during his youth he crossed the Bali Strait to stay in Java and later ruled the kingdom in East Java.

He belongs to both Isyana and Warmadewa lineages.