In this study, Rumex abyssinicus (R. abyssinicus) roots were used for dye extraction via Soxhlet extraction. The effects of particle size, solid-to-liquid ratio and extraction time on dye yield were examined. The optimization of dye extraction wascarried out using response surface methodology coupled with the Box–Behnken approach. A maximum dye yield of 53 % was attained at an optimumparticle size of 0.355 mm, a solid-to-liquid ratio of 0.075 g/mL and an extraction time of 5 h. Functional group analysis using FTIR and a UV–vis spectrophotometer was performed to determine the characteristics of the extracted dye. The FTIR analysis results showed the presence of various functional groups in the extracted dye. Additionally, UV–vis spectrophotometer confirmed that the maximum absorbance peakwas detected at 281 nm, with an absorbance of 0.908. Overall, the results show that R. abyssinicus root is a potential source ofdye that has applications in various industries.