In this paper, the effects of pH (1.5-8.0), initial element concentration (0.5 to 20 mg L −1 .) and sorbent dosage (1-20 g L-1) were investigated on the potential use of hazelnut processing plant wastes, hazelnut shell (SH) and hazelnut skin (SK), for the simultaneous removal of Al, Cr, Cu, Cd, Pb, As and Fe from water. The surface morphology of the sorbents, elemental analysis, FTIR, SEM-EDS and BET analysis were performed and specific surface areas of the sorbents were found as 0.676 m 2 g-1 (for SH) and 0.768 m 2 g-1 (for SK). The results showed that surfaces of both sorbents are rough, contains pores that allow to entrap heavy metals and functional groups such as carboxylic acid, phenolic compounds, etc. to which the heavy metal ions can attach. While the optimum pH was determined as 5.0 for all elements in both sorbent systems, the percent removal of heavy metal increased with increase in initial heavy metal concentration up to 8 mg L-1 (except cadmium for SH and copper and cadmium for SK). While optimum sorbent dosage was obtained 10 g L-1 for SH sorbent, increase of sorbent amount led to a decrease of the percentage of removal for SK. Adsorption models were used for the mathematical description of adsorption equilibrium and isotherm constants were evaluated at room temperature (22 ± 2 •C). The adsorption equilibrium data were fitted well to Langmuir and Langmuir-Freundlich models in most cases and showed favorable adsorption behavior