The aim of this diploma thesis is to explore the way how the gender performativity is portrayed in Xavier Dolan's films. The theoretical part of the thesis first deals with the definition and theoretical grounding of gender performativity from the perspective of several authors, mainly Judith Butler. This part of the thesis will detailly introduce the concepts of gender performativity, which will be necessary for the analysis of the studied films. The theoretical part also presents the queer theory and the related chapter devoted to queer film, which would also include Dolan's work. Lastly, this part also includes a chapter devoted to the concept of mise-en-scène. The methodological part introduces the method of semiotic analysis and introduces the synopsis of the studied films. The analytical part of the work presents its own semiotic analysis of the examined films. The aim of the analytical part is to find out how Dolan works with gender performativity in his films and how it is visually portrayed.