The technology of wind turbines is advancing. Larger onshore and offshore turbines, as well as floating turbines, need a dynamic study that takes into account thorough load modelling. The limit states are governed by loads in operating and survival situations, such as faults, controller operations, and response-induced pressures. Bottom-fixed applications are well-known in the wind turbine sector. Floating wind turbines, on the other hand, are still in the early stages of development. This chapter introduces loads for both onshore and offshore wind turbines, with an emphasis on wave- and wind-induced loads, which are used to measure wind turbine structural integrity and power output.