Abstract Bunyamwera virus ( BUNV ) ( B unyaviridae, genus Orthobunyavirus , serogroup B unyamwera) is considered an emerging pathogen for humans and animals in A merican countries. The CbaAr ‐426 strain of BUNV was recovered from mosquitoes Ochlerotatus albifasciatus (Diptera: Culicidae) collected in C órdoba province ( A rgentina), where serological studies detected high seroprevalences in humans and animals. Molecular detection of Orthobunyavirus was performed in mosquitoes collected in C órdoba province . Seventeen mosquito pools of Oc. albifasciatus , Ochlerotatus scapularis and Culex quinquefasciatus (Diptera: Culicidae) showed positive results; four of these positive pools, all of Oc. scapularis , were sequenced. All amplicons grouped with BUNV in the B unyamwera serogroup. The findings highlight the circulation of BUNV in C órdoba province and represent the first report of BUNV ‐infected Oc. scapularis mosquitoes in A rgentina.