The Silesian Voivodeship was an autonomous province (voivodeship) of the Second Polish Republic. The bulk of its territory had formerly belonged to the German/Prussian Province of Silesia and became part of the newly reborn Poland as a result of the 1921 Upper Silesia plebiscite, the Geneva Conventions, three Upper Silesian Uprisings, and the eventual partition of Upper Silesia between Poland, Germany and Czechoslovakia. The remainder had been the easternmost portion of Austrian Silesia which was partitioned between Poland and Czechoslovakia following the collapse of Austria-Hungary, the Polish–Czechoslovak War and the Spa Conference of 1920. The capital of the voivodeship was Katowice.

A voivodeship or voivodate is the area administered by a voivode (governor) in several countries of central and eastern Europe. Voivodeships have existed since medieval times and the area of extent of voivodeship resembles that of a duchy in western medieval states, much as the title of voivode was equivalent to that of a duke. Other roughly equivalent titles and areas in medieval Eastern Europe included ban and banate.