This thesis aims to investigate the inseparable relationship between structure and what Lacan invented throughout his seminars and designated as object a. This course is based on a systematic investigation of Lacan s Seminars, which are privileged in this research. Our assumption, the reading hypothesis that this work intends to demonstrate, consists of the indication that the theme of the object is more present in the Seminars than in Lacan s Ecrits (1966). Initially, we seek to demarcate a sort of genealogy of the object throughout Lacan s Seminars until the arrival of its nomination as object a in Seminar 6, Desire and its interpretation (1958-1959). From this conceptual, logical-temporal genealogy, we then address Seminars 10 (1962-1963) and Seminar 11 (1964). The reading hypothesis that we seek to demonstrate, at this point, is to locate a formalization on the theme of object (a) in Lacan s teaching. At this point, we characterize his definition by highlighting that there is no object a, according to Lacan, if there is no symbolic order. Then, we propose an exercise in reading and applying the concept: initially from the reading of the novel A Paixão Segundo G.H (1964) by Clarice Lispector. In this chapter, we approach the relationship between objects in Clarice s text and the function of object a in Lacan s teaching. Finally, we refer to another possible name for the real in Lacan s teaching: the dimension of the letter in his teaching. This concept will be discussed from a second interlocution with the field of literature, in particular, with the short story Report on the thing (1974) by Clarice Lispector.