Volhynia (/vˈlɪniə/; Ukrainian: Волинь, romanized: Volyn', Polish: Wołyń Polish pronunciation: ['vowɨɲ]), is a historic region in Central and Eastern Europe, between south-eastern Poland, south-western Belarus, and western Ukraine. The borders of the region are not clearly defined, but the territory that still carries the name is Volyn Oblast, in western Ukraine. Volhynia has changed hands numerous times throughout history and been divided among competing powers. At one time all of Volhynia was part of the Pale of Settlement designated by Imperial Russia on its southwesternmost border.

Lubart's Castle (Lutsk) was the seat of the medieval princes of Volhynia.
Volhynia (yellow) in modern Ukraine
Coordinates: 50°44′42.0″N 25°21′13.7″E
CountryPoland, Belarus, Ukraine
RegionSoutheastern Poland, Southwestern Belarus, Western Ukraine
PartsVolyn Oblast, Rivne Oblast, Zhytomyr Oblast, Ternopil Oblast, Khmelnytskyi Oblast, Lublin Voivodeship, Brest Region

Important cities include Lutsk, Rivne, Volodymyr-Volynskyi (Volodymyr), Iziaslav, and Novohrad-Volynskyi (Zviahel). After the annexation of Volhynia by the Russian Empire as part of the Partitions of Poland, it also included the cities of Zhytomyr, Ovruch, Korosten. The city of Zviahel was renamed Novohrad-Volynsky, and Volodymyr became Volodymyr-Volynskyi.