Law, as a language, fulfills different communicational functions that it achieves, largely, through the use of narrative tools and devices. Among them, legal fictions stand out, which, far from portraying reality, seek to create a legal truth. In the case of constitutional fictions, these are often misinterpreted, leading to their degeneration. In this text, beyond offering a conceptual approach to the figure of constitutional fictions, an introductory analysis is offered as to how this has occurred in the context of the new Latin American constitutionalism.