This thesis examines the incorporation of tango into operas by Argentine composers by investigating the motivations that led composers and librettists to integrate this genre into their lyric works, the concrete modalities of this incorporation, and the meanings it conveys. The musical, literary, and scenic analysis of nineteen operas created between 1929 and 2019 reveals that this incorporation responds to multiple and intertwined factors — concerns related to national history and memory, strategies of communicability with audiences, responses to commissions from international funding organizations — and operates according to variable degrees of integration, from occasional allusion to structural fusion. The study also unveils a duality between the creators’ identity affirmation and exotic appropriation, which traverses the entire body of works and structures both compositional choices and reception dynamics. By constituting an unprecedented corpus, this research contributes both to understanding the historical and aesthetic development of the operatic genre during the last century and to that of the symbolic evolution of tango. It also enables us to grasp the dynamics between Argentine cultural history and the international context, highlighting the mechanisms by which creators negotiate between local traditions, aesthetic aspirations, and international circuits of cultural legitimation.