The Idalion bilingual is a bilingual Cypriot–Phoenician inscription found in 1869 in Dali, Cyprus. It was the key to the decipherment of the Cypriot syllabary, in the manner of the Rosetta Stone to hieroglyphs. The discovery of the inscription was first announced by Paul Schröder in May 1872. It is dated to 388 BCE. The Phoenician inscription is known as KAI 38 and CIS I 89.
It was discovered by Robert Hamilton Lang in his excavations at the Temple of Idaliom, whose work there had been inspired by the discovery of the Idalion Tablet in 1850. The stone was found in the centre of the temple, together with the five other Idalion Temple inscriptions. The stone is thought to have been a pedestal for a statue, as there is an apparent dowel hole in the top.