We studied measles incidence and morbidity in Ghazvin district by retrospective review of cases registered at the central health office and admitted to two hospital in Ghazvin city during April 1997-April 2003. There were 824 clinically confirmed cases of measles over the 6-year period giving a mean annual incidence of 18.67 per 100 000 population, higher than for the country generally. There were no deaths from measles. Of the 824 cases, 591 (71.1%) had serum specimens for serological analysis and 199 (24.3%) were confirmed serologically. Of the serologically confirmed cases, the greatest proportion (44.2%) were over 20 years (median age was 17.5 years), 54.5% had been in contact with a measles case and 21.6% cases had received 2 doses of vaccine. We studied 33 serologically confirmed hospitalized cases. Common complications were vomiting (45.5%), diarrhoea (42.4%) and pneumonia (21.2%). The mean duration of hospitalization was 3.8 days.