A survey of weevils occurring in the Biebrza National Park (BbPN) and its surroundings within the Biebrza Basin was conducted in the years 2021-2022, as a part of the updated edition of the invertebrate section of the Park Protection Plan. It resulted in finding 24 species new for the Biebrza Basin, thus increasing the number of Curculionoidea (excepting Scolytinae) species known from this region to 505. The newly discovered species (indicated with asterisk preceding its name) belong to families Anthribidae (2), Attelabidae (1), Apionidae (3), and Curculionidae (18). Anthonomus rubripes GYLLENHAL was rediscovered in a buffer zone of the Biebrza National Park, after its extinction in its sole previously known Polish locality in Osowiec Twierdza confirmed after 2005. Bagous czwalinai SEIDLITZ was collected in two more localities in the Biebrza National Park, and its biological association with Ranunculus lingua L., not with R. sceleratus L., was confirmed. Lixus tibialis BOHEMAN, formerly known in BbPN from a single site in the Lower Basin, turned out to be more widespread and present also in the Middle Basin. In 2021-2022 a great decrease in the abundance of practically all hygrophilous weevil species was observed in the Lower Biebrza, compared to results of the previous surveys conducted in the years 1999-2004.
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