Congo red (CR), known for its intricate molecular structure containing diverse diazo aromatic groups, finds extensive application as an anionic dye in the textile industry. Various techniques are employed to eliminate dyes from wastewater, with adsorption being widely regarded as a highly effective and dependable method. It is cost-effective, efficient, and ease to operate. In this current study, the removal of CR from synthetic wastewater was examined utilizing ridge gourd fiber as an adsorbent in a batch mode process. The material was characterized by XRD and FTIR analysis. The influence of various operating parameters such as pollutant concentration, adsorbent dose, contact time, pH, and temperature on the decolorization efficiency of CR were investigated through the experimental studies. The study found that there was a decrease in colour removal efficiency as the pollutant concentration increased. The maximum colour removal efficiency, i.e. ~80% was achieved at a pollutant concentration of 10 mg/L, adsorbent dose of 25 g/L, with a contact time of 45 min in acidic condition. The decolorization efficiency was higher in the acidic pH range. The maximum adsorption capacity of the ridge gourd fiber for removing CR was found 0.45 mg/g with a CR concentration of 20 mg/L and fiber dose of 20 g/L.