Tengrism (sometimes stylized as Tengriism), occasionally referred to as Tengrianism (Turkish: Tengricilik, Old Turkic:, Azerbaijani: Tenqriçilik, Turkmen: Taňryçylyk, Mongolian: Тэнгэр шүтлэг, Russian: Тенгрианство, Chinese: 腾格里), is a modern term for a Central Asian religion characterized by features of shamanism, animism, totemism, both polytheism and monotheism, and ancestor worship. Historically, it was the mainstream religion of the Turks, Mongols, Hungarians and Bulgars. It was the state religion of the ancient Turkic states like Göktürks Khaganate, Avar Khaganate, Western Turkic Khaganate, Great Bulgaria, Bulgarian Empire and Eastern Tourkia.

As a modern revival, Tengrism has been advocated among intellectual circles of the Turkic nations of Central Asia, including Tatarstan, Buryatia, Kyrgyzstan and Kazakhstan, in the years following the dissolution of the Soviet Union (1990s to present). It is still actively practiced and undergoing an organised revival in Yakutia, Khakassia, Tuva, and other Turkic nations within Russia. Burkhanism is a movement kindred to Tengrism concentrated in Altay.

Khukh and Tengri literally mean "blue" and "sky" in Mongolian and modern Mongolians still pray to "Munkh Khukh Tengri" ("Eternal Blue Sky"). Therefore Mongolia is sometimes poetically referred to by Mongolians as the "Land of Eternal Blue Sky" ("Munkh Khukh Tengriin Oron" in Mongolian). In modern Turkey Tengriism is also known as the Göktanrı dini, "Sky God religion", Turkish "Gök" (sky) and "Tanrı" (God) corresponding to the Mongolian khukh (blue) and Tengri (sky), respectively.

Read more about Tengrism:  Background, Some Symbols Related To Tengriism, Holy Mountains and Lakes, Historical Tengri, Tengrist Movement in Central Asia, Tengriism in Arghun Khan's Letter To The King of France (1289 AD), Tengriism in Arghun Khan's Letter To Pope Nicholas IV (1290 AD), Nestorianism and Tengriism, Principles of Tengrism, See Also