In this study, manganese oxide (II, III) nanoparticles were synthesized and used as a new coating for solid-phase microextraction of 1-methyl naphthalene, anthracene, and pyrene as model analytes. The material was charachterized by FT-IR, SEM, and XRD techniques. The key experimental parameters affecting the extraction efficiency including organic solvent types, ionic strength, extraction temperature, extraction time, desorption temperature and desorption time, were investigated and optimized. Gas chromatography-mass spectrometry was used for quantification of the analytes. Under the optimized conditions, a linear dynamic range of 5-3000 ng L -1 was obtained for all the analytes with detection limits in the range of 0.7-2.4 ng L -1 . Relative standard deviations were in the range of 2.0 to 13.0%. The method was successfully applied for the analysis of wastewater samples with spiking recoveries higher than 77%.