In this study, effects of coupling agent addition on adhesive wear, thermal and morphological properties of glass fiber-reinforced polyamide 6,6 (PA6,6) composites were investigated. 1,4-Phenylene-bis-oxazoline (PBO) was used as coupling agent to improve the interfacial adhesion between glass fiber and PA6,6 matrix. While coupling agent loading level was changed as 0.5, 1.0 and 2.0wt%, glass fiber loading level was fixed at 10wt% in the composites. For tribological characterization of prepared composites, adhesive wear test was performed. Differential scanning calorimeter analysis and thermogravimetric analysis were performed for thermal characterization. In addition to this, scanning electron microscopy analysis was applied to investigate the worn surfaces and fracture surfaces of samples. Applied test results revealed that 2wt% PBO addition improved the fiber-matrix adhesion and correspondingly adhesive wear resistance of glass fiber-reinforced PA6,6 matrix composites.