This issue of «Teoria» is a reflection on the theme of trust, starting from its etymological meaning and considering the multiple areas in which trust plays a role in inter-human relations. This is the first of two volumes of “Theory†devoted to the theme. In this issue the theme of trust is looked at more closely from a theoretical perspective and through a multidisciplinary approach. The next issue will focus on some authors of the history of thought in whose work this question has been explicitly addressed.