Zeolites have been shown to be effective adsorbents for the removal of heavy metals from aqueous solutions. In this study, mordenite (a natural zeolite) has been used for the removal of lead ions to evaluate its potential use as a low-cost adsorbent. Batch experiments have been conducted to evaluate the equilibrium and process kinetics at different temperatures. The equilibrium experimental data for various temperatures studied conformed to the six adsorption isotherm equations: the Langnmir, Freundlich, Sips, Redlich-Peterson (RP), Dubinin-Radwhkevich (DR), and Flory-Huggins (FH). Constants were determined for each of the isotherms. The apparent thermodynamic parameters were calculated and the obtained values supported the conclusion that the lead ions adsorption onto mordenite was a spontaneous, exothermic process of physical nature. The kinetic experimental data fitted the pseudo-second-order, parabolic diffusion and Elovich equations successfully. The process of lead ions adsorption onto the Na-mordenite was diffusion-controlled. The value of apparent activation energy also confirmed a physical mechanism for the adsorption of lead ions onto Na-mordenite.