BACKGROUND: Arboviruses are one of the greatest threats to animal and public health. METHODS: In this study, which was conducted between 2019 and 2020 in different parts of Qom city, 83 414 mosquitoes were collected, and after evaluating the species of mosquitoes based on morphological and molecular detection, the presence of alphaviruses, flaviviruses, and phleboviruses were evaluated using genus-specific Reverse transcription polymerase chain reaction (RT-PCR) assays. RESULTS: In this study, CONCLUSION: Climatic and weather changes are the basis for the growth and spread of vectors and, consequently, the spread of arboviral diseases, and this issue seems to be very important to the necessity of increasing and continuing entomological and virological studies.