This thesis examines, characterizes and quantifies how women and men are being presented on Czech and Slovak Wikipedia and further elaborates on their possible differences. The theoretical part of the thesis describes the current state of Wikipedia and media in general and draws attention to gender inequality within its editorial base, which is linked to the general trend in free culture communities, where there is also a visible inequality. Furthermore, the theoretical part of the thesis also deals with the issue of gender in general and summarizes current state of knowledge and methods of studying the issue of gender on Wikipedia. The practical part of this thesis partly replicates the study First Gender, Second Sex: Gender Bias on Wikipedia (Graells- Garrido, Lalmas and Menczer, 2015) using RStudio programme to do basic text mining and quantitative analysis of biographical texts of men and women in both languages, tracking word frequencies from selected word categories, namely Gender, Reference to the opposite sex, Family and family status and Career. Overall, we have analysed 24 510 Slovak biographical articles and 110 866 Czech biographical articles, and our findings have confirmed an imbalance and stereotyping in the presentation of women on Wikipedia in both languages.