Introduction:Adsorption has been extensively reported as a successful method for removing potentially toxic metals from wastewater. Aim: This study investigated the efficiency of raw Phoenix dactylifera L. as an adsorbent for the removal of Pb (II) and Mn (II) ions from model wastewater. Method: Batch adsorption process. Results: The initial and the equilibrium metal ion concentrations were determined using the atomic absorption spectroscopy, while the raw Phoenix dactylifera L was characterized using the scanning electron microscope and Fourier transform infrared spectroscopy (FTIR). The effects of metal ion concentrations, the kinetics, pH, adsorbent dosage, and temperature on the metal ion bio-sorption were also investigated. The pH-dependent adsorption of the metal ions revealed an optimum pH of 3.0, and a maximum percentage removal of 93.37% for Pb (II) and 97.57% for Mn (II) across the entire concentrations range. The results of the modelling analysis of the adsorption isotherms showed that the correlation coefficient for Temkin was the highest with 0.976 for Pb (II) and 0.955 for Mn (II) ions. The kinetic studies of both ions followed the pseudo-second-order reaction kinetic while the thermodynamic analysis (maximum adsorption) indicated that the process was spontaneous and exothermic with value of ∆G of -183.91 kJ/molK for Pb (II), and -379.31 kJ/molK for Mn (II).and ∆H values of -0.065 kJ/mol for Pb (II) and -0.841 kJ/mol for Mn (II) respectively. Conclusion: Overall, the adsorbent demonstrated a significant potential for effective removal of the metal ions of interest.