The Luwian language belongs to the Luwic subgroup of the Indo-European Anatolian languages and is a close relative of Hittite. It was used for writing in the Empire of Hattusa and the Neo-Hittite states, which arose after its collapse (appr. 1400-700 BC). It is recorded in two scripts: an adaptation of Mesopotamian cuneiform and Anatolian hieroglyphs. The goal of this article is to provide a concise description of the Luwian language. It contains both information on its structure, with an emphasis on phonology and morphology, and sociolinguistic data. The grammatical description is predominantly synchronic, but historical and comparative information is occasionally introduced if it has a potential to clarify the synchronic state of affairs.