Köýtendag Nature Reserve, formerly Kugitang Nature Reserve, is a nature reserve (zapovednik) in the extreme east of Turkmenistan.
Established in 1986, it is located in the Köýtendag Range of Lebap Province and covers an area of 271.4 km². The reserve is home for the rare Heptner's markhor (Capra falconeri heptneri).
It also incorporates four sanctuaries:
- National Program for the Protection of the Environment, Ashgabat, 2002, pp. 149-151 (in Russian)