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In this study, by modifying the montmorillonite mineral with chitosan, chitosan/montmorillonite composites were synthesized, and research was performed as to its usage as an adsorbent in removing Remazol Brillant Blue R and Malachite Green dyestuffs from aqueous solutions. SEM, FT-IR, XRD, and BET analysis techniques were utilized to determine the characteristics of the synthesized composite. The effects of different batch parameters such as initial pH value (2−9), contact time (5–120 min), initial dyestuff concentration (50–300 mg/ L), adsorbent dose (0.05–0.5 g/100 mL), and process temperature (293–313 K) on the adsorption process were examined. The optimum pH was 2 for RBBR, whereas it was 8 for MG. Also, the optimum removal time was 120 min for RBBR; it was 210 min for MG. As per the Langmuir isotherm model, the maximum adsorption capacity (qmax) was found as 332.58 mg/ g for RBBR …