With the current trend of increasing rotor size, structural health monitoring is becoming critical to the blades of the wind turbine. One solution to this is Acoustic Emission Monitoring in which propagating cracks within a structure are detected via piezoelectric transducers, usually at the nucleus stage. However, Acoustic emission detection ranges, and therefore effectiveness, will be largely influenced by inherent material attenuation mechanisms. Another complication is that wind turbine blade (WTB) materials are often anisotropic in nature, meaning attenuation will vary with propagation direction. Therefore, this study aims to determine attenuation coefficients for a variety of composite materials that are commonly used for WTB applications. A better understanding of how these materials attenuate acoustic emission signals may allow operators to appropriately equip wind turbine blades with acoustic emission sensors, resulting in optimal sensor placement.