The presence of heavy metals in the aquatic ecosystems has caused many environmental problems. These elements enter the environment through natural factors, especially because of industrial and agricultural activities, urban wastewater, and accumulate in the aquatic organisms via the food chain. Aquatic plants, as a link in the food chain, can indicate relative increases in the concentrations of heavy metals in the deposits of the ecosystem in sediments because they are able to absorb heavy metals. Common cattail ( Typha latifolia ) is an aquatic and wetland macrophyte that lives at the edges of lakes, swamps, rivers, and wetland in the warm and tropical regions and is often found in dense populations and in the form of colonies in these aquatic systems. This research was conducted with the purpose of studying the accumulation of the heavy metals including lead, cadmium, and zinc in common cattail and in the deposits of Anzali international wetland. The measured concentrations of the mentioned metals in the deposits and in the roots , stems, and leaves were 26.7 , 18.59, 10.47, and 13.7 micrograms per gram dry weight for lead, 4.36, 3.80, 3.10, 3.42 micrograms per gram dry weight for cadmium, and 88.44, 91.14, 61.17, and 23.84 micrograms per gram dry weight for zinc, respectively. Results showed that the eastern part of the wetland was the most polluted. Results concerning the means of concentrations of lead in the different organs of common cattail indicate that there are differences in the amounts of this metal absorbed by the roots, stems, and leaves of this plant. The largest bioconcentration factor (BCF) ratio was that of zinc, and cadmium had the maximum transfer factor (TF). The high TF for cadmium may be due to the ease of its transfer and to the high mobility of this metal. Results indicated the studied plant is a suitable biological monitor for studying the mentioned metals in the different parts of the lagoon. Moreover, it must be noted that this plant has an important role in modifying and reducing pollutions in the lagoon because of its wide distribution in the lagoon and due to the rates of accumulation of these metals in this plant and, therefore, common cattail maybe considered as a phytoremediant species in the Anzali wetland. Keywords Heavy metals, Common cattail, Anzali wetland, Phytoremediation, Bioconcentration factor