The aim of this master's thesis is to analyze Irish national identity using posters from the second decade of the twentieth century. The first chapter provides a theoretical framework of national identity and clarification of related terms such as nationalism, nation, nationality, and national consciousness. This chapter also explains the development of Irish national identity. The second chapter focuses on Irish national identity in images in posters depicting geographic features and traditional Irish symbols. The third chapter deals with Irish national identity in text-only posters.