The objective of this study was to assess the impact of body mass index (BMI) on transobturator tape (TOT) success rates, patient acceptability and complications 1 year following surgery. The medical records of stress urinary incontinence (SUI) and mixed urinary incontinence (MUI) patients who underwent the TOT operation were retrospectively reviewed. The patients were divided into non-obese (BMI < 25) and obese (BMI ≥ 30) groups. Baseline and 1 year post-surgical outcomes were assessed by including multichannel urodynamics, Urogenital Distress Inventory (UDI-6) scores, Incontinence Impact Questionnaire (IIQ-7) scores and cure, failure and success rates. There were no significant differences between groups in terms of urodynamic parameters, objective cure rate and subjective success, quality of life scores, or postoperative complications. Both obese and non-obese patients had cure and/or improvement of their symptoms and had better quality-of-life in the postoperative period. As a conclusion, BMI does not affect the clinical effectiveness of TOT operation in the treatment of female SUI or MUI.