In appropriately selected patients an orthotopic neobladder (ONB) permits the elimination of an external stoma and preservation of body image without compromising cancer control after radical cystectomy. Voiding dysfunction (VD) following ONB can be divided into failure to empty bladder or failure to store urine. Failure to empty bladder by angulation of urethra is the most common cause. Failure to store urine can occur during daytime, night-time or both. VD that persists beyond 6 to 12 months warrants urodynamics evaluation to determine the cause and suggest plane of therapy. Voiding dysfunction has a detrimental impact on quality of life.