ObjectiveThis study was conducted to determine the presence, type, and rate of parasitic contamination in Iranian currencies. Study designThis was a cross-sectional study. MethodsCoins and banknotes of different denominations were randomly collected from sellers and markets in Tabriz, Northwest of Iran, for examining parasitic contamination. ResultsEntamoeba coli and Giardia intestinalis were the most identified species of parasites in this study. Other parasites detected were Cryptosporidium parvum, Ascaris lumbricoides, Entamoeba histolytica, Fasciola hepatica, and Toxocara cati. A high rate of parasitic contamination was found in banknotes compared with coins, and a statistically significant association was found between parasitic contamination and the apparent condition of the currencies. The notes of lower denominations showed the highest contamination rates. The highest parasitic contamination was found in coins and banknotes obtained from public toilet services, butchers, and beggars. ConclusionsThe findings emphasize the role of circulating coins and banknotes in the risk of pathogenic parasite transmission.