Background & Objectives: Dyes are one of the main pollutants in textile wastewater and due to their molecular structures, they are usually toxic, carcinogen and persistent in the environment. Therefore, the aim of present work was to compare efficiency of LECA and coral limestone to remove Reactive Orange 3R from aqueous solution. Methods: Present work is a basic-applicable study in which, LECA and coral limestone were used as efficient adsorbents for removal of Reactive Orange 3R. The adsorbent characteristics were determined by X-ray fluorescence and X-ray diffraction methods. Experimental parameters included adsorbent concentration, contact time, dye concentration, and solution pH, which were tested in a batch system. In addition, data acquired from equilibrium constant were evaluated using various isotherm and kinetic models. Results: Results showed that dye removal efficiency for both adsorbents was increased with increasing contact time and adsorbent mass, while decreased with increasing solution pH and initial dye concentration. Dye removal efficiency increased with increasing contact time and reached to equilibrium after 180 minutes. At same condition, increasing initial dye concentration from 50 mg/L to 150 mg/L, decreased removal efficiency of coral limestone and LECA by 29 and 33%, respectively. Equilibrium data was fitted onto both Freundlich and Langmuir isotherm models with higher correlation coefficient (R2=0.987) found for Langmuir isotherm model. In addition, data for time-concentration profile was best fitted to both pseudo first order and pseudo second order kinetic model with higher correlation coefficient (R2>0.98) for pseudo second order kinetic model. Conclusion: Results reveal that coral limestone has higher efficiency than LECA in removal of Reactive Orange 3R dye. Tested adsorbents due to their appropriate density, rapid settling properties, and no residual in solution can be applied in dye removal easier than other adsorbents.