Nosocomial infections are a real concern in health systems around the world, and in the individual care of patients in hospitals. It is necessary to note that these infections are contracted in hospital after 48 hours of hospitalization and 30 days in the postoperative period. A study on the prevalence of nosocomial infections conducted under the aegis of the world Health Organization (WHO) revealed that on average 8.7% of hospitalized patients had acquired a nosocomial infection, which is also the case in our country. The causes of these nosocomial infections are multiple, related to both care procedures and behavioural practices. In 2011, the prevalence of nosocomial infections in Morocco was estimated at 5.5%, 38.8% of which are surgical site infections. The purpose of this work is to determine the prevalence of surgical site infections in surgical care units in a hospital center in Morocco. The study was conducted at the IBN BAJA Provincial Hospital Centre in TAZA in April 2018 and 2019, the sample size was 52 patients hospitalized on the day of the survey in 2018 and 41 in 2019, the data collection was done by a standardized questionnaire and the prevalence survey was conducted in a single round for each one of the surgical care units. The results revealed a prevalence rate of 13.48% (7/52) in 2018 and 12.19% (5/41) in 2019 among operated patients, with a variation according to care units. Hence, it was higher in the gynecology service 43% (3/7) in 2018 and in female surgery in 2019 with a percentage of 60% (3/5); but it was absent in the child surgery unit in both years.