In this paper, the author provides a description and an explanation of regional variation in gender wage gaps in Poland, and shows that the gap is especially large in the Silesian Voivodeship (ca 25.44%). He presents several explanations for this phenomenon. First, gender wage discrimination is likely to be especially strong in Silesia. Second, in this region, men typically work in bigger firms than women. Third, the distribution of women between different occupations and industries in Silesia is especially disadvantageous for their relative wages. Fourth, the structure of occupational wage differentials in Silesia is also unfavourable for women, i.e. predominantly female occupations pay relatively less in Silesia than in other regions.