The flag of Upper Silesia (Fana Gůrnygo Ślůnska [ˈfa.na gur.ˈnɪgo ˈɕlonska]) serves as the symbol of the historical and geographical region of the Upper Silesia in Poland, and as one of the symbols of the Silesian people; it is divided horizontally into two stripes: yellow on the top and blue on the bottom.

[1] The Duchy of Upper and Lower Silesia, an autonomous region of Kingdom of Bohemia, within Austria-Hungary used a flag horizontally divided into two stripes, which were black on top, and yellow on the bottom.

The colours came from the coat of arms of Lower Silesia, which features black eagle on a yellow background.

[5] Currently, the yellow and blue flag is used as one of the symbols of the Silesian people, especially those inhabiting the area of Upper Silesia.

The coat of arms depicts a yellow (golden) eagle on the blue background within the Old French style escutcheon.

[8] On 11 June 2001, the Silesian Voivodeship adopted its civil and state flags, based on yellow and blue colours of the coat of arms of Upper Silesia.

[9] The state flag of the voivodeship is a blue rectangle, with an aspect ratio of its height to its width equal 5:8.