This research paper investigates the impact of abaca fiber content and length on the mechanical properties of concrete. The study involved the preparation of concrete specimens with varying abaca fiber compositions and fiber lengths, which were then tested for compressive strength, tensile strength, and flexural strength after 28 days of curing. The results indicate that the incorporation of abaca fibers can lead to significant improvements in the mechanical performance of the concrete, with the optimal fiber content and length found to be 0.1% and 50 mm, respectively, resulting in a 12% increase in compressive strength and a 25% increase in flexural strength compared to the control sample without fibers. Multiple regression analysis and ANOVA were used to develop predictive models for the compressive and flexural strengths as a function of the fiber characteristics, demonstrating strong statistical significance and goodness-of-fit, with R-squared values of 89.29% and 87.69%, respectively. The findings of this study highlight the potential of abaca fiber-reinforced concrete to enhance the mechanical properties of concrete elements, while also providing guidance on the optimal fiber content and length to achieve these improvements.