Diurnal enuresis is characterized by incontinence during making hours and can lead to some physical and psychological problems if adequate treatment does no follow. In this study, a behavior treatment was conducted to five girls presenting with diurnal enuresis due to organic and functional factors. The behavior treatment was represented by a single-subject design and used timed voiding and positive reinforcement. Time at urination, amount of urination, degree of wet pants, and fluid intakes were collected during making time. As a result, all the patients showed a decrease in the degree of wet pants and three patients displayed an increase in the amount of urination or in fluid intakes. The results of this study support the effectiveness of the behavior treatment and the need for a wider use of behavior treatment. Limitaions of this study and suggestions for future studies are discussed.