The effect of grape seed extract (GSE) (at 5, 10 and 15%) incorporated into chitosan (CH) film was evaluated by considering its physico-mechanical properties, antioxidant and antimicrobial activities in order to show improved shelf life for vacuum-packed food under refrigerated conditions. GSE-incorporated films showed higher water vapor permeability, elastic modulus, opacity, and a* and b* values (p < 0.05). Increasing the GSE concentration lowered the transmittance and L* values. The addition of GSE provided antioxidant activity to the CH films and the addition of 15% GSE into CH films inhibited the oxidation of chicken breast fillets during refrigerated storage (p < 0.05). GSE-incorporated CH films inhibited Escherichia coli, Listeria monocytogenes, Staphylococcus aureus and Pseudomonas aeruginosa more efficiently than CH films alone. CH films incorporating 15% GSE inhibited total mesophilic aerobic bacteria (TMAB) and coliforms in chicken breast fillets (p < 0.05) and provided a 1.50-2.33 log reduction in TMAB and coliforms, respectively, during storage. These results reveal that the inclusion of GSE into CH films has the potential to help develop antioxidant/antimicrobial packaging for food products.