Ultrasound of the bladder is used in clinical practice as a non-invasive estimate of bladder volume when assessing post-void urinary residual. Two types of ultrasound equipment are dedicated bladder scanner and standard linear array transabdominal or transvaginal ultrasound. Ultrasound of the bladder neck can be used to assess urethral hypermobility. Increased bladder neck mobility is associated with stress urinary incontinence. The volume of the urethral sphincter can be measured using three-dimensional ultrasound. Measurement of the thickness of the bladder wall has been validated using the transvaginal, transperineal, translabial or transabdominal approach. The ultrasound is likely to be used increasingly to provide the anatomical parameters in conjunction with functional parameters provided by urodynamics. Two-dimensional and three-dimensional ultrasounds have been employed to statically and dynamically image the pelvic floor. The application of ultrasound in the identification of levator injury is currently being used as a research tool.