Oxytocin is a neuropeptide containing nine amino acids produced by paraventricular and supraoptic nuclei of hypothalamus. Oxytocin is derived from a Greek word 'oxutokia' meaning sudden delivery and it is well known for its role in parturition and lactation. In addition oxytocin performs a wide spectrum of functions. Oxytocin is a hormone with great potential and it is a great facilitator of life. The purpose of this review is to cover almost all the functions of oxytocin -reproductive functions, social functions, role in human behaviour and other biologically significant functions..