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RNA viromes of nine commonly encountered <i>Ochlerotatus</i> mosquito species collected around Finland in 2015 and 2017 were studied using next-generation sequencing. Mosquito homogenates were sequenced from 91 pools comprising 16–60 morphologically identified adult females of <i>Oc. cantans</i>, <i>Oc. caspius</i>, <i>Oc. communis</i>, <i>Oc. diantaeus</i>, <i>Oc. excrucians</i>, <i>Oc. hexodontus</i>, <i>Oc. intrudens</i>, <i>Oc. pullatus</i> and <i>Oc. punctor</i>/<i>punctodes</i>. In total 514 viral Reverse dependent RNA polymerase (RdRp) sequences of 159 virus species were recovered, belonging to 25 families or equivalent rank, as follows: <i>Aliusviridae</i>, <i>Aspiviridae</i>, <i>Botybirnavirus</i>, <i>Chrysoviridae</i>, <i>Chuviridae</i>, <i>Endornaviridae</i>, <i>Flaviviridae</i>, <i>Iflaviridae</i>, <i>Negevirus</i>, <i>Partitiviridae</i>, <i>Permutotetraviridae</i>, <i>Phasmaviridae</i>, <i>Phenuiviridae</i>, <i>Picornaviridae</i>, <i>Qinviridae</i>, <i>Quenyavirus</i>, <i>Rhabdoviridae</i>, <i>Sedoreoviridae</i>, <i>Solemoviridae</i>, <i>Spinareoviridae</i>, <i>Togaviridae</i>, <i>Totiviridae</i>, <i>Virgaviridae</i>, <i>Xinmoviridae</i> and <i>Yueviridae</i>. Of these, 147 are tentatively novel viruses. One sequence of <i>Sindbis virus</i>, which causes Pogosta disease in humans, was detected from <i>Oc. communis</i> from Pohjois-Karjala. This study greatly increases the number of mosquito-associated viruses known from Finland and presents the northern-most mosquito-associated viruses in Europe to date.