Wind energy is one of the important renewable energy resources because of its reliability due to the maturity of the technology, relative cost competitiveness, good infrastructure which is obtained without any constraint. These wind energies are converted into electrical energy with the help of wind turbine to produce power. To harvest more electrical yield, the wind turbine must be bigger. Due to its large structure, periodic failures are inevitable. Maintenance of such large structure can be cumbersome. The wind turbines must be checked every now and then to enhance security, to minimize down time, to recurrence of sudden breakdowns with related to enormous maintenance and logistic expenses and to give a maximum potential output power generation. Structural health condition monitoring (SHCM) and fault diagnosis methods (FDM) are used to evaluate the damage which has occurred in wind turbine. This review gives comprehensive information on FDM and SHCM of a wind turbine. © 2006-2016 Asian Research Publishing Network (ARPN).