Introduction: Achieving the goal of "zero new human immunodeficiency virus (HIV) infections by 2030" requires the elimination of HIV transmission within serodiscordant couples. In Benin, the phenomenon of HIV serodiscordance remains poorly documented. Objective: the aim of this study was to determine the prevalence of HIV serodiscordance and its associated factors among infected couples in the city of Parakou. Study Framework and Method: This was a descriptive cross-sectional study with an analytical focusing on qualitative and quantitative plans. It was carried out on thirty approved sites in the city of Parakou between July and December 2022. We used a non-exhaustive convenience sample of people living with HIV (PLHIV) whose partner's status was known. Data collection took place in two phases: an interview phase during which sociodemographic, economic, behavioral and marital/social data were collected. The second phase focused on clinical and therapeutic data which were collected from the patients' personal records. Results: A total of 417 study subjects were recruited. The average age (SD) of the subjects was 38.17 (±10.25) years [37.19 -39.16]. Females accounted for the largest proportion (79.62%). Most respondents (74.11%) were married. Monogamous unions were the most frequent, involving 67.87% of participants, most of whom (44.60%) had been infected for between 1 and 5 years.