Thecivil flag of theSilesian Voivodeship,Poland istriband rectangle, divided into three horizontal stripes, that are from top to bottom: blue, yellow, and blue. The blue stripes are twice the size of the yellow middle stripe.[1] Thestate flag is a blue rectangle with yellow eagle placed in its centre.[2] It was designed by Barbara Widłak,[3] and adopted on 11 June 2001.[1]
Thecivil flag of theSilesian Voivodeship,Poland is atriband rectangle, with anaspect ratio of height to width of 5:8. It is divided into three stripes, that are from top to bottom: blue, yellow, and blue. The blue stripes are twice the size of the yellow middle stripe. Their proportion of the flag is2⁄5 each, while the yellow stripe is1⁄5.[1]
Thestate flag of the voivodeship is a blue rectangle, with anaspect ratio of height to width of 5:8. In its centre is placed a yelloweagle, adopted from thecoat of arms of the voivodeship.[2]
The colours of the coat of arms and the flag refer to thecoat of arms of Upper Silesia, historically used as a symbol of the dynasty ofSilesian Piasts, who ruled in theduchies in theUpper Silesia. The coat of arms depicts a yellow eagle on the blue background, similar to the one in the voivodeship symbols.[4]
Additionally, there are also vertical versions of both civil and state flags.[5]
The colour scheme of the flags is officially defined as:
| Colour model | Dark Blue | Gold |
|---|---|---|
| Pantone | Blue 2728 | Yellow 116 |
| RGB | (48,68,181) | (252,209,22) |
| CMYK | 73.62.0.29 | 0.17.91.1 |
| HTML | #FCD116 | #3044B5 |

TheDuchy of Upper and Lower Silesia, an autonomous region ofKingdom of Bohemia, withinAustria-Hungary used a flag horizontally divided into two stripes, which were black on top, and yellow on the bottom. The colours came from theoat of arms of Lower Silesia, which features black eagle on a yellow background. It is unknown where the flag begun being used. The state itself existed from 1742 to 1918.[6]

TheProvince of Upper Silesia of theFree State of Prussia, adopted itsflag in 1920. It was rectangle divided horizontally into two stripes: yellow on top, and dark blue on the bottom. Theaspect ratio of its height to its width was equal 2:3. Its colours had been based on thecoat of arms of Upper Silesia. It was used until 1935, whenNazi Germany forbid its provinces from flying its flags, ordering them to replace them with thenational flag.[7][8]

On 23 April 1920, theUnion of Upper Silesians, an independence movement forUpper Silesia, proposed a design for a flag of the potential Upper Silesian independent state. The flag would be divided horizontally into three stripes, that were, from top to bottom: black, white, and yellow. The movement operated until 1924.[9]
TheSilesian Voivodeship was established in 1999.[10] Its flags were designed by Barbara Widłak,[3] and adopted by theSilesian Regional Assembly on 11 June 2001.[1] Since 2011, on 15 July, in the Silesian Voivodeship is celebrated the Day of the Silesian Flag.[11]