Different viral diseases infect common bean crops in Iran. A total of 248 symptomatic samples were collected from common bean fields throughout main growing fields of Guilan province in Iran during the summer of 2006. Eight viruses were detected using double antibody-sandwich -enzyme-linked immunosorbent assay (DAS-ELISA). Bean common mosaic virus -BCMV (1%), Bean leaf roll virus -BLRV (9%), Cowpea mild mottle virus -CpMMV (6%), Southern bean mosaic virus -SBMV (3%), Cucumber mosaic virus -CMV (15%), Bean golden mosaic virus -BGMV (2%), Bean common mosaic necrosis virus -BCMNV (1%) and Bean yellow mosaic virus -BYMV (1%) were detected. Comparatively CMV (15%) was found to be more prevalent in Guilan province. Multiple infections of viruses were recorded in many samples. Weed species belonging to Chenopodiaceae, Solanaceae, Malvaceae and Amaranthaceae families were also found to be infected with the viruses.