This study investigates the enhancement of tribological properties in polyester resin composites reinforced with pineapple leaf fibers of different lengths (4, 8, 12, and 16 mm) using the hand layup technique combined with compression load. The composite with 16 mm fiber length exhibited the highest hardness (77.8±0.6 HV), wear resistance (0.0065 mm³/Nm at 10 N and 20 N), and coefficient of friction (0.73 at 20 N and 1 m/s). The wear debris surface was analyzed using SEM. The composite with 16 mm pineapple leaf fiber is recommended for automotive seat frame applications due to its superior tribological performance. The study highlights the importance of fiber length and chemical treatment in enhancing the mechanical and tribological properties of natural fiber-reinforced composites.This study investigates the enhancement of tribological properties in polyester resin composites reinforced with pineapple leaf fibers of different lengths (4, 8, 12, and 16 mm) using the hand layup technique combined with compression load. The composite with 16 mm fiber length exhibited the highest hardness (77.8±0.6 HV), wear resistance (0.0065 mm³/Nm at 10 N and 20 N), and coefficient of friction (0.73 at 20 N and 1 m/s). The wear debris surface was analyzed using SEM. The composite with 16 mm pineapple leaf fiber is recommended for automotive seat frame applications due to its superior tribological performance. The study highlights the importance of fiber length and chemical treatment in enhancing the mechanical and tribological properties of natural fiber-reinforced composites.