Masovian Voivodeship (1816–1837)

The Masovian Voivodeship was an administrative division (voivodeship) of the Kingdom of Poland, also known as Congress Poland, which was established by the Congress of Vienna in 1815 and was in personal union with the Russian Empire. It existed from 1816 to 1837.

The voivodeship was created from territory previously part of the Duchy of Warsaw. Its capital was Warsaw.

In 1837, as part of the administrative reforms implemented following the November Uprising (1830-1831), the Masovian Voivodeship was transformed into the Masovian Governorate (Gubernia Mazowiecka). This change reflected the Russian Empire's intent to integrate the Kingdom of Poland more closely into its own administrative structure and to diminish its distinct identity.

The Masovian Voivodeship, though short-lived, played a role in the administrative and political landscape of Congress Poland during a period of significant socio-economic development and increasing political tension between the Polish population and the Russian authorities. Its existence marked a transitionary phase between the Duchy of Warsaw and the full imposition of Russian administrative control.