Triturus vulgaris kosswigi Freytag, 1955 Kosswig's smooth newt (Lissotriton kosswigi) is a newt species found in northwestern Anatolia, east of the Bosphorus.

[3] After genetic data had suggested the smooth newt was a complex of distinct lineages,[7] Dubois and Raffaëlli, in 2009, recognised several subspecies, including Kosswig's smooth newt, as distinct species.

The well-developed dorso-lateral folds give the body a square shape.

[6]: 234 Paedomorphic adults have been reported for Kosswig's smooth newt.

[10] Due to a limited range, a fragmented population and a continuous decline to the extent and quality of its habitat, the species is listed as vulnerable.