This Book is a sincere attempt to present vibration analysis of bearings and also the analysis of defects in the bearings that cause the vibrations and its minimization using analytical as well as experimental setup. Life of any rolling element bearing depends upon some of the important parameters like operating conditions, quality of lubrication and presence of surface irregularity if any. These parameters are main sources of vibrations in the rotor bearing system. These vibrations affect the endurance strength of bearing leads to its failure in turns failure of machinery. Hence a careful study has to be done in order to avoid the failure of the rotating equipments by studying the different defects occurring in them, their locations and what are the main causes need to be identified.