Observer members of the International Organization of Turkic Culture

Northern Cyprus, officially the Turkish Republic of Northern Cyprus (TRNC), is a de facto state that comprises the northeastern portion of the island of Cyprus. It is recognised only by Turkey, and its territory is considered by all other states to be part of the Republic of Cyprus.

Tatarstan, officially the Republic of Tatarstan, sometimes also called Tataria, is a republic of Russia located in Eastern Europe. It is a part of the Volga Federal District; and its capital and largest city is Kazan, an important cultural centre in Russia. The region's main source of wealth is oil with a strong petrochemical industry.

Gagauzia or Gagauz-Yeri, officially the Autonomous Territorial Unit of Gagauzia (ATUG), is an autonomous territorial unit of Moldova. Its autonomy is intended for the local Gagauz people, a Turkic-speaking, primarily Orthodox Christian ethnic group.

Sakha, officially the Republic of Sakha (Yakutia), is the largest republic of Russia, located in the Russian Far East, along the Arctic Ocean, with a population of one million. Sakha comprises half of the area of its governing Far Eastern Federal District, and is the world's largest country subdivision, covering over 3,083,523 square kilometers (1,190,555 sq mi). Yakutsk, which is the world's coldest major city, is its capital and largest city.

Khakassia, officially the Republic of Khakassia, is a republic of Russia located in southern Siberia. It is situated between Krasnoyarsk Krai to the north and the Altai Republic to the south.

Tuva (Russian: Тува) or Tyva (Tuvan: Тыва), officially the Republic of Tuva, is a republic of Russia. Tuva lies at the geographical center of Asia, in southern Siberia. The republic borders the federal subjects of the Altai Republic, Buryatia, Irkutsk Oblast, Khakassia, and Krasnoyarsk Krai, and shares an international border with Mongolia to the south. Tuva has a population of 336,651 (2021 census). Its capital city is Kyzyl, in which more than a third of the population reside.

The Altai Republic (Altay: Алтай Республика, Altay Respublika; Russian: Респу́блика Алта́й, Respublika Altay, Kazakh: Алтай Республикасы), also known as Gorno-Altai Republic, and colloquially, and primarily referred to in Russian to distinguish from the neighbouring Altai Krai as the Gornyi Altai (Russian: Горный Алтай, Gornyy Altay, 'the mountainous Altai'), is a republic of Russia located in southern Siberia. The republic borders the Russian federal subjects of Kemerovo Oblast to the north, Khakassia to the northeast, Tuva to the east, Altai Krai to the west, as well it borders three countries: Mongolia to the southeast, China to the south and Kazakhstan to the southwest. It is a part of the Siberian Federal District, and covers an area of 92,903 square kilometers (35,870 sq mi), with a population of 210,924 residents. It is the least-populous republic of Russia and least-populous federal subject in the Siberian Federal District. Gorno-Altaysk is the capital and the largest town of the republic with 65,342 inhabitants and in urban areas, making it the least urbanized federal subject.

Bashkortostan or Bashkiria, officially the Republic of Bashkortostan, is a republic of Russia between the Volga river and the Ural Mountains in Eastern Europe. The republic borders Perm Krai to the north, Sverdlovsk Oblast to the northeast, Chelyabinsk Oblast to the east, Orenburg Oblast to the south, Tatarstan to the west and Udmurtia to the northwest. It covers 143,600 square kilometres (55,400 square miles) and has a population of 4 million. It is the seventh-most populous federal subject in Russia and the most populous republic. Its capital and largest city is Ufa.