Kurdish (Kurdî, کوردی) is a language or a group of languages spoken by Kurds in the geo-cultural region of Kurdistan and the Kurdish diaspora. Kurdish constitutes a dialect continuum, belonging to Western Iranian languages in the Indo-European language family. The main three dialects or languages of Kurdish are Northern Kurdish (Kurmanji), Central Kurdish (Sorani), and Southern Kurdish (Xwarîn).

A separate group of non-Kurdish Northwestern Iranian languages, the Zaza–Gorani languages, are also spoken by several million ethnic Kurds. The majority of the Kurds speak Kurmanji, and most Kurdish texts are written in Kurmanji and Sorani. Kurmanji is written in the Hawar alphabet, a derivation of the Latin script, and Sorani is written in the Sorani alphabet, a derivation of Arabic script.

The classification of Laki as a dialect of Southern Kurdish or as a fourth language under Kurdish is a matter of debate, but the differences between Laki and other Southern Kurdish dialects are minimal.

The literary output in Kurdish was mostly confined to poetry until the early 20th century, when more general literature became developed. Today, the two principal written Kurdish dialects are Kurmanji and Sorani. Sorani is, along with Arabic, one of the two official languages of Iraq and is in political documents simply referred to as "Kurdish".