The present investigation examines the effect of nano-sized WC particles on the scratch response of WC-reinforced aluminum composites. Stir casting along with ultrasonic vibration are employed in the current study to produce Al-WC nano-composites. The amount of reinforcement is varied among four different weight percentages of WC (0.5, 1, 1.5, and 2). Scratch tests are performed to evaluate the impact of both the weight percentage of tungsten carbide (WC) and the operating load applied during the evaluation of scratch response. The scratch resistance is evaluated for Al-WC nano-composites as well as base alloy. It is observed that scratch width decreases with an increase in the amount of reinforcement from 0.5% to 2%. Under 20N load, this reduction in scratch width is found to be 14.15% compared to the scratch width observed for base alloy. When the operating load is increased from 5 to 20N, an increment in scratch width is observed. The base alloy and Al-WC nano-composites are characterized through scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX) to establish a correlation between the experimental findings and alterations in surface morphology.