In this study, the dynamic shear properties of a composite honeycomb core material made of glass fiber reinforced (epoxy resin and vinyl ester) polymers without and with reinforcement of carbon nanotubes are investigated. The carboxylic acid functionalized multi-walled CNTs were randomly dispersed into an organic solvent (extra pure acetone) to split and add homogeneously into the vinyl ester resin by using the ultra-sonication technique®. The honeycomb composite test materials were made through the high carbon-chromium corrugation honeycomb die using the vacuum-assisted hand-layup technique. The vibration analysis of honeycomb materials was performed experimentally to obtain the shear moduli along the corrugation (Gxz) and joining (Gyz) directions based on the dynamic approach. The results showed that the reinforcement of CNTs in the composite honeycomb materials would enhance the shear moduli significantly without any modifications in the mass of the honeycomb structure. The strong interfacial bonding and random addition of CNTs in the composites improve the shear properties considerably than that of honeycomb without CNT reinforcement. This result provides the guidelines for the modern designer on increasing the shear properties of the honeycomb composite structures using the CNT reinforcement © 2019 Elsevier Ltd.