Viipuri Province (Viipurin lääni, commonly abbreviated Vpl, Viborgs län or Wiborgs län, Выборгская губерния) was a historical province of Finland from 1812 to 1945.
The predecessor of the province was Vyborg Governorate, which was established in 1744 from territories ceded by the Swedish Empire to Russia in 1721 (Treaty of Nystad) and in 1743 (Treaty of Åbo). These territories originated as parts of the Viborg and Nyslott County and Kexholm County in 1721, and parts of the Savolax and Kymmenegård County in 1743. The governorate was also known as Old Finland.
During the Napoleonic Wars, the Kingdom of Sweden had allied itself with the Russian Empire, United Kingdom and other parties against Napoleonic France. However, following the Treaty of Tilsit in 1807, Russia made peace with France. In 1808, supported by France, Russia successfully challenged Swedish control over Finland in the Finnish War. In the Treaty of Fredrikshamn on September 17, 1809, Sweden was obliged to cede all its territory in Finland east of the Torne River to Russia. The ceded territories became a part of the Russian Empire and were reconstituted into the autonomic Grand Duchy of Finland, with the Russian Tsar as Grand Duke.
In 1812, the territories of the Vyborg Governorate were transferred from Russia proper to the Grand Duchy of Finland and established as Viipuri Province. The transfer announced by Tsar Alexander I just before Christmas, on December 23, 1811 O.S. (January 4, 1812 N.S.), can be seen as a symbolic gesture and an attempt to appease the sentiment of the Finnish population, which had just experienced Russian conquest of their country by force. Siestarjoki was transferred to Saint Petersburg Governorate in 1864.
When Finland became independent from Russia in 1917, the status of Viipuri Province remained unchanged. The provincial capital, Vyborg (Viborg, Viipuri), was at this time the fourth largest city in Finland.
Viipuri Province had sided with the Finnish Socialist Workers' Republic during the Finnish Civil War.