A B S T R A C TT his paper investigated the moisture absorption, mechanical behavior and the dielectric performance of hybrid and non-hybrid polymeric composites. Hand lay-up technique was used for processing carbon; glass reinforced polyester resin composites (non-hybrid) and carbon-glass/polyester hybrid composites with various fiber configurations. The maximum resistance of water absorption was obtained for the hybrid composites with combinations [2C-2G], where the water absorption ratio reached to 1%. In addition, the maximum tensile, flexural strengths and ILSS of t his combination were 123 MPa, 1397 MPa, and 22.35 MPa, respectively. This is due to the higher tensile strength of polyester matrix and good adhesion between the glass and carbon fabrics with the polyester matrix. The dielectric constant of nonhybrid composite with codes [C] is higher than non-hybrid composite with codes [G] and dielectric constant for all hybrid composites lies between non -hybrid composites.