Tomsk Oblast (Russian: То́мская о́бласть, Tomskaya oblast) is a federal subject of Russia (an oblast). It lies in the southeastern West Siberian Plain, in the southwest of the Siberian Federal District. Its administrative center is the city of Tomsk. Population: 1,047,394 (2010 Census).

The development of the territory which now constitutes the oblast began in the early 17th century. Tomsk itself was founded in 1604. Most of the oblast's 316,900 square kilometers (122,400 sq mi) territory is inaccessible because it is covered with taiga woods and swamps. Tomsk oblast contains Vasyugan Swamp, the biggest swamp in the northern hemisphere. The oblast borders with Krasnoyarsk Krai and Tyumen, Omsk, Novosibirsk, and Kemerovo Oblasts.

Long before Siberia became part of Russia, the territory of modern Tomsk Oblast was inhabited by people belonging to the taiga Kulayskoy civilization known for its bronze artifacts.

The development of the region began in the end of the 16th and early 17th centuries. The oldest settlement in the area is the village (former city) Narym, founded in 1596.

The administrative center of the province, the city of Tomsk, was founded in 1604. From 1719 to 1804 in the province of Tobolsk. In 1782, is formed by Tomskaya oblast in the composition of Tobolsky namestnichestva (from 1796 - Tobolskaya guberniya). In 1804 the Tomsk province was founded, which existed until 1925, when it became part of the Siberian region (since 1930 - the West Siberian region). Tomsk oblast was established August 13, 1944 by isolation from the Novosibirsk region of the districts and the former Narym District. On July 26, 1995 the Oblast's charter was adopted.

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