Bipolaris salkadehensis sp. nov., isolated from the leaves of Sparganium erectum (Thyphaceae) and Cladium mariscus (Cyperaceae) collected in Iran, is described and illustrated. The new species is characterized by straight to slightly curved subcylindrical to fusoid conidia with end cells demarcated by thick dark septa and with monopolar and bipolar germination. Morphological data and ITS+5.8SrDNA sequence analyses support B. salkadehensis as a distinct species of Bipolaris.