Objective: To assess the association between objective bladder function parameters in relation to urinary symptoms, and to analyze the sensitivity and specificity of subjective urinary symptom-assessment in predicting objective bladder dysfunction in a multiple sclerosis (MS) population. Methods: Consecutive MS patients with Expanded Disability Status Score (EDSS) ≤7.0 were included in this prospective study. In a single visit, patients were evaluated for the presence of urinary symptoms, then assessed for the following urological parameters: maximum urinary flow rate (Qmax), postvoid residual urine volume (PVR), and detrusor sphincter dyssinergia (DSD). Results: One hundred nine subjects were included with a mean disease duration of 12.5 ± 8.7 years, 90.8% had a relapsing-remitting course; the mean EDSS score was 2.6 ± 1.7. Overall, 53.5% complained of at least one urinary symptom, and the most reported one was urgency (40.7%), followed by frequency (15.7%) and incomplete emptying (12.0%). Abnormal values were found for Qmax in 34.9%, for PVR in 40.4% of participants; DSD was diagnosed in 33.9% of the cases. Only Qmax was found negatively associated with the EDSS score (p = 0.007), but no other association was observed. The presence of urinary symptoms was poor predictor of bladder dysfunction, urgency among the others showed relatively higher predicting value. Conclusions: Subjective urinary symptoms assessment failed in predicting bladder function. Our results confirmed the value of objective urological assessment in patients with MS, irrespective of the presence of urinary symptoms.