In recent years, natural fiber reinforced polymer composites have garnered considerable attention compared to synthetic fiber composites due to their numerous advantages, including low cost, lightweight, non-toxicity, non-abrasiveness, and biodegradability. Many researchers have exhibited an interest in employing epoxy resin for composite fabrication over other thermosetting and thermoplastic polymers due to its dimensional stability and mechanical properties. In this chapter, the mechanical and moisture properties of Caryota and sisal fiber-reinforced epoxy resin hybrid composites were examined (Atmakuri et al. in Polymers 13(6):1–19, 2021 [1]). The primary objective of these studies is to develop hybrid composites and highlight their significance over single fiber composites. The Caryota and sisal fiber reinforced epoxy resin composites were fabricated employing the hand lay-up technique. A total of five distinct samples (40C/0S, 25C/15S, 20C/20S, 15C/25S, 0C/40S) were developed based on the principle of hybridization. The samples were subjected to testing to assess their mechanical and moisture properties, and the morphology was analyzed using scanning electron microscopy. It was observed that hybrid composites demonstrated enhanced mechanical properties relative to single fiber (individual fiber) composites. The moisture studies indicated that all composites responded to water absorption, but single fiber composites absorbed more moisture than hybrid composites.