Dengue fever is a major public health problem in tropical countries. Clinical manifestations range from a nonspecific viral syndrome to a severe fatal hemorrhagic disease. Menorrhagia as the sole presentation in dengue among the women is very rare. We report two adult women who presented with high fever, generalized bodyache with severe menstrual bleeding without any history of amenorrhea or any previous menstrual abnormality. Dengue was suspected because of thrombocytopenia and epidemic of dengue in West Bengal. In dengue epidemic area, dengue should be considered as a probable eitiological causes of menorrhagia. We have confirmed these case by NS1Ag, Dengue IgM antibody, IgG antibody and Low platelate count in their blood.