The use of ultrasound in processing creates novel and interesting methodologies which are often complementary to classical techniques. It has proved particularly useful in sterilisation, extraction, freezing and filtration providing reduced processing times and increased efficiency. Current studies have identified a number of other areas including the stimulation of living cells and enzymes, improved processing of reformed meat and grain treatment. There is wide scope for further research into the use of ultrasound in food processing both from an industrial and academic viewpoint.