The paper deals with species diversity of Scarabaeoidea (Coleoptera) of Guilan Province, Northern Iran. In total 22 species of 17 genera (Adoretus LAPORTE, Aethiessa BURMEISTER, Anomala SAMOUELLE, Aphodius ILLIGER, Blitopertha REITTER, Cetonia FABRICIUS, Glaphyrus LATREILLE, Gymnopleurus ILLIGER, Onthophagus LATREILLE, Oryctes ILLIGER, Oxythyrea MULSANT, Paroniticellus BALTHASAR, Pentodon HOPE, Polyphylla HARRIS, Protaetia BURMEISTER, Scarabaeus LINNAEUS, Valgus SCRIBA) were collected and identified. Protaetia funesta (MEN.) has been recorded from Iran for the first time.