Tyumen is the administrative center and largest city of Tyumen Oblast, Russia. It is situated just east of the Ural Mountains, along the Tura River. Fueled by the Russian oil and gas industry, Tyumen has experienced rapid population growth in recent years, rising to a population of 847,488 at the 2021 Census. Tyumen is among the largest cities of the Ural region and the Ural Federal District. Tyumen is often regarded as the first Siberian city, from the western direction.

Tyumen Oblast is a federal subject of Russia. It is located in Western Siberia, and is administratively part of the Urals Federal District. The oblast has administrative jurisdiction over two autonomous okrugs: Khanty-Mansi Autonomous Okrug and Yamalo-Nenets Autonomous Okrug. Tyumen Oblast, including its autonomous okrugs, is the third-largest federal subject by area, and has a population of 3,395,755 (2010).