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Microplastics (MPs) have recently been detected in different products and environmental samples, ranging from wastewater to drinking water, as well as in products consumed by humans. However, few studies have addressed the contamination by MPs in bottled mineral water. Therefore, in the present study, the contamination by MPs was investigated from 11 samples of popular brands of bottled mineral water in Iran. Using a staining method and stereomicroscope analysis, MPs were detected in 9 out of the 11 sample brands. The amount, shape, and color of MPs varied in different bottles. The most detected MPs were in the shape of fragment (93 %) and fiber (7%), with an average concentration of approximately 8.5 ± 10.2 particles/L. In addition, there were no MPs in 20 % of the collected samples, which was the reason for the observed high variation of SD. The presence of MPs was demonstrated by FTIR and …