The book "Environmental Effects on Hybrid FRP Composites" offers a comprehensive examination of the impact of moisture and temperature on the mechanical properties of hybrid fiber-reinforced composites. Through experimental studies, various carbon-glass-epoxy hybrids produced by hand lamination are analyzed. The investigation includes the assessment of mechanical properties under different environmental conditions, including hygrothermal influences and extreme temperatures. The results demonstrate significant changes in mechanical properties, particularly in samples exposed to high temperatures. The book is aimed at professionals and students engaged in the properties and applications of composite materials.