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In this study a total of 37 syrphid species belonging to 25 genera were identified in Mazandaran province, northern Iran. One genus and species, Brachyopa (Brachyopa) bicolor (Fallén, 1817) and two species Heringia (Neocnemodon) latitarsis (Egger, 1865) and Cheilosia soror (Zetterstedt, 1843) are recorded for the first time from Iran. In addition, saproxylic syrphids of Iran are briefly discussed.