Introduction:Erectile dysfunction is defined by the inability to obtain or maintain an erection sufficient to allow a satisfactory sexual relationship, according to the 2nd International Conference on Sexual Dysfunctions of 2004. This constitutes an attack on virility, and is a source of significant psychological suffering for the individual as well as for his partner. Erectile dysfunction is also a multifactorial disease, related to the overall physical and psychological health of the patient. Materials And Methods: The survey was conducted during three months in the military hospital of Avicenne in Marrakesh. It involved all patients consulting in Urology aged over 18 years regardless of the reason of consultation. Data was collected through a questionnaire by direct interview. The evaluation of ED was based on the definition of the 2nd International Conference of Sexual Dysfunction of 2004. Results: The analysis included 482 patients. The average age of patients was 51 ± 11 years. The main reason for consultation was a prostate problem (45.2%). ED was indicated as reason for consultation by 5.1% of patients. The overall prevalence of ED was 46%. 35.2% already discussed it with a doctor. ED was significantly correlated with age, benign prostatic hyperplasia, cardiovascular risk factors, prostate and pelvic surgery (P<0.001). 29.7% of ED patients used PDE5 inhibitors, 54% found it to be effective. Conclusion: This survey confirms the high prevalence of ED and its important underreporting. Physicians are encouraged to ask patients about ED, especially since there are now simple and effective therapies.