Dust is one of the most important atmospheric pollutants that has significant impacts on air quality, human health, and marine and terrestrial ecosystems in the West Asian region. In this study, dry deposition of dust particles during a dust storm in the Persian Gulf and the Strait of Hormuz from 28 to 31 July 2018 is investigated as a case study. In order to simulate dry deposition, the WRF-CHEM model was used and the results were compared with CAMS reanalysis data. During this period, the dust storm was accompanied by prevailing northwesterly (northern) winds. The results show that the maximum deposition flux coincided with the increase in surface suspended particle concentration and intensification of wind speed. The spatial pattern of maximum deposition in the northern and northwestern parts of the Persian Gulf indicates that the dust transport pathways are consistent with the dynamic conditions of the atmosphere. The WRF-CHEM output is in good agreement with the CAMS data in terms of the temporal and spatial distribution of dry deposition, although there are some differences, especially at the peak of the event. This also indicates a strong correlation between the two datasets (R = 0.76), meaning that WRF-Chem successfully captures the temporal variations of dry dust particle deposition. This finding emphasizes the importance of accurate numerical simulations and the use of reanalysis data to improve understanding of the assessment of mineral inputs to the marine ecosystems of the Persian Gulf.