The environmental fate of phenyl urea herbicides in ecosystems is strongly influenced by their sorption on natural sorbents. Clay and sediment colloids are the most important contributors in fixing pesticides and other organic compounds. The present work studies the adsorption of monuron in some mineral sorbents (clays extracted from tow Moroccan soils (CESS and CEBS) and tow commercial clays type montmorillonite M and kaolin Ka). Clay characterization was done using Infrared spectroscopy and X-ray powder diffraction. Batch sorption experiments were carried out under various conditions to determine the influence of solution chemistry (herbicide concentration, pH and solid-liquid ratio). The adsorption data could be fitted with Freundlich isotherms and the coefficients indicated favourable adsorption of monuron on all clays studied; Kf values varied according clay type: 9.6 and 19.4 for kaolin and montmorillonite respectively; 6.5 and 10.6 for CEBS and CESS respectively.