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During the study of flower flies (Diptera: Syrphidae) associated with colza (Brassica napus) fields in Sari (Mazandaran Province, Iran) in 2015–2016, a total of six species i.e. Episyrphus balteatus (De Geer), Eupeodes corollae (Fabricius), Melanostoma mellinum (Linnaeus), Paragus bicolor (Fabricius), Syrphus ribesii (Linnaeus) and Platycheirus jaerensis Nielsen are recorded for this region. Among them, P. jaerensis Nielsen is newly recorded for the Iranian fauna.