The occurrence of Watermelon mosaic virus (WMV) in sweet pepper (Capsicum annuum L.) in Kurdistan province, Iran was confirmed by reverse transcriptase- polymerase chain reaction (RT-PCR) and partial characterization of coat protein. To the best of our knowledge, this is the first report of WMV infecting C. annuum, adding a new host to list of more than 170 species infected by this virus.