The Principality of Volhynia (Ukrainian: Волинське князівство) was a western Kievan Rus' principality founded by the Rurikid prince Vsevolod in 987 centered in the region of Volhynia, straddling the borders of modern-day Ukraine, Belarus, and Poland.

After losing Turov to Monomakhovichi in 1105, the descendants of Iziaslav Yaroslavovich for a few years continued to rule in Volhynia.

The principality held the lands of the historic region of Volhynia from where it acquired its name.

The capital of the principality as well as the largest and most important city of the region was Volodymyr.

Other notable cities in the principality include Kremenets, Lutsk, Busk, Dorogobuzh, Brest, Belz, and Shumsk.