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Halys may refer to:
- Halys River, a western name for the Kızılırmak River (Turkish: "Red River") in Anatolia
- Halys (genus), a genus of stink bugs
- A taxonomic synonym for the genus Gloydius, also known as Asian moccasin snakes, a group of venomous pitvipers found in Asia
- Gloydius halys, also known by the names Halys viper and Halys pit viper
|This disambiguation page lists articles associated with the title Halys.
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