Purpose: This research was carried out in order to examine the effect of clean intermittent catheterization (CIC) training with a video developed by the researchers on patients’ ability to practice CIC and self-confidence.Methods: The population of the study consisted of patients who had just started performing CIC in the urology polyclinic of a city hospital in Istanbul. The sample consisted of a total of 80 patients, 40 of whom were in the experimental group and 40 in the control group. The experimental group patients were given CIC training with a training video that was downloaded to the mobile phone of the patient, a family member, or caregiver. The patients’ practice skills were evaluated by 2 independent observers. The DISCERN Inquiry Form and the Global Quality Score, the Patient Information Form, the CIC Skill Checklist and the Self-Confidence Scale in Clean Intermittent Self-Catheterization were used to collect data.Results: In the experimental group, consisting of patients who received video-assisted training, the mean scores for the CIC Skill Checklist and the Self-Confidence Scale in Clean Intermittent Self-Catheterization were statistically significantly higher than in the control group (P<0.001), the experience of feeling pain during catheterization was less than in the control group, and the patients in the experimental group experienced statistically significantly fewer complications such as urinary tract infections, urgency, urinary incontinence, hematuria and urethral stricture (P<0.05).Conclusions: Video-assisted CIC training had a positive effect on patients’ practical skills and self-confidence.