Tyumen Oblast is a federal subject (an oblast) of Russia. It is located in Western Siberia, and is administratively part of the Ural Federal District. The oblast has administrative jurisdiction over two autonomous okrugs: the Khanty-Mansi and Yamalo-Nenets Autonomous Okrug. The oblast, including its autonomous okrugs, is the third-largest federal subject by area, and has a population of 3,395,755 (2010).
Tyumen is the largest city and the administrative center of the oblast, and the first Russian settlement east of the Ural Mountains.
Tyumen Oblast is the largest producer of oil and natural gas in the country, and has experienced an oil boom since the early 2000s. The rapid growth of the fuel industry has made the oblast by far the richest federal subject of Russia, with an average GDP per capita several times the national average since 2006.