Slope stability is a critical concern in geotechnical engineering, especially in regions prone to landslides and erosion. Conventional methods for soil stabilization, such as the use of chemical additives like cement and lime, often raise environmental and sustainability concerns. In this study, explore the potential of using guar gum, a natural biopolymer, as an eco-friendly alternative to improve soil strength and stability. The primary objective is to assess the effectiveness of guar gum in enhancing soil properties and its impact on slope stability, using both laboratory experiments and numerical simulations with PLAXIS 3D software. Laboratory tests, including compaction test and UCS, were conducted on untreated and guar gum-treated soils at varying concentrations. The results demonstrated significant improvements in soil cohesion and shear strength with increasing guar gum content. The results highlight the potential of guar gum biopolymer as a sustainable and effective solution for slope stabilization. This study not only contributes to the understanding of biopolymer-treated soils but also provides insights into their practical applications for environmentally conscious geotechnical engineering practices.