In North America, the most common cause of vulvar ulcers is infection with herpes simplex virus. However, Epstein-Barr virus can also cause vulvar ulcers, and may be underrecognized. Unlike herpes simplex virus, Epstein-Barr virus is not necessarily sexually transmitted. Therefore, it is particularly important to include in the differential diagnosis of genital ulcers for patients for whom a diagnosis of a venereal infection has important psychosocial consequences. We report three cases of acute primary Epstein-Barr virus infection in which the presenting symptoms were vulvar ulceration.