MS patients frequently present with urinary system symptoms, which have a negative effect on the quality life. The aim of our study was to demonstrate the validity and reliability of the Turkish King's Health Questionnaire (KHQ) in MS patients. The study included 37 patients. For analysis of test-retest reliability, the Turkish version of the KHQ developed and the "translation-back translation" method was performed. To assess the validity of these results, Multiple Sclerosis Quality of Life Scale (MQoL-54) and Expanded Disability Status Scale (EDSS) were used. The internal consistency (intra-class correlation coefficient: 0.59-0.94) and test-retest reliability (Cronbach's alpha-score 0.59-0.94) of KHQ were found to be high (p < 0.05). A significant correlation was detected between most of the KHQ subscores and the physical and mental MQoL-54 and EDSS (total and bowel/bladder, p < 0.05) subscores. The KHQ may be used to determine the effect of incontinence on the quality of life for MS patients.