Tarḫunz (stem: Tarḫunt-) was the weather god and chief god of the Luwians, a people of Bronze Age and early Iron Age Anatolia. He is closely associated with the Hittite god Tarḫunna and the Hurrian god Teshub.

The name of the Proto-Anatolian weather god can be reconstructed as *Tṛḫu-ent- ("conquering"), a participle form of the Proto-Indo-European root *terh₂, "to cross over, pass through, overcome". It has cognates in Hittite tarḫu-, Latin trans-, Dutch door, German durch, and English through. The same name was used in almost all Anatolian languages: Hittite Tarḫunna-; Carian Trquδ-; Milyan Trqqñt-, and Lycian: Trqqas (A), Trqqiz (B), who has been identified with Zeus.

Norbert Oettinger has argued that the functions of the Anatolian weather god ultimately come from the Proto-Indo-European deity *Perkʷūnos, but a new epithet *Tṛḫu-ent- ("conquering") was coined that sounded close to the name of the Hattian storm god Taru.

In Luwian cuneiform of the Bronze Age, his name appears as Tarḫunt- (Tarḫuwant- in the oldest texts). He is also named using the Sumerograms ^dU ("God 10") or ^dIM ("God Wind"). In hieroglyphic Luwian, his name was written as Tarhunza- and Tarhunta- or with the ideograms (DEUS) TONITRUS ("God Thunder").

The name Tarhunt- is also cognate to the present participle turvant-, also meaning "vanquishing, conquering", an epithet of Vedic deity Indra.

The god's name often appears in personal names. The oldest example is "Tarḫuan", known from a 19th-century BC Hittite text from Kültepe. Among the Luwians, it was customary for people to bear a simple god's name, but names were often combined. In the Bronze Age and Early Iron Age, these names are very common. The latest examples derive from Hellenistic southern Anatolia, like Tarkumbios (Ταρκυμβίος, luw. *Tarhun-piya- "Tarhun-Gift“) or Trokombigremis (Τροκομβίγρεμις; *Tarhun-pihra-mi- "Shining Tarhun") which are attested in Cilicia.

Further attestations of the deity's name appear as Tarhundaradu, a king of Arzawa, and variation Tarhunnaradu, believed to be the Hittite version of the former, and both referring to the same person, attested in the Ortaköy Letters. In a 2022 paper, scholar Ignasi Xavier Adiego [es] postulates the existence of "four different Luwian (and Luwic) stems: Tarhu̯ant-/Tarhunt-, Tarhun-, Tarhu- and Tarhunza". In addition, following Starke, he adduces further onomastic evidence, namely, a royal scribe's name Tarḫu(n)mii̯a, Cilician names Ταρκυννις, Ταρκυμ-βιας, Τροκον-βιας, Τροκομ-βιγρεμις, Τροκον-γιλανις; and a Lycian name Τροκομ-μας.

The Hittite city Tarḫuntašša was named after the god.