This lecture introduces the concept of utopia as a literary form, focusing on the works of Thomas More and Tommaso Campanella. It explores the key characteristics of utopian narratives, such as the encounter with unknown territories, the notion of true semblance, and the use of irony. The lecture delves into the rationality behind utopian societies, discussing themes like communal ownership, equality, and the role of family structures. It also touches on the relationship between utopia and dystopia, highlighting the importance of coherence in utopian visions. Through a detailed analysis of texts from the 16th and 17th centuries, the lecture provides insights into the historical context and philosophical underpinnings of utopian literature.