This paper presents summaries of the eight cases of insulinoma which occurred in the Auckland area (annual incidence 1 in 1.5 x 10(6) between 1 January 1970 and 31 December 1985. These were five males (ages 28, 28, 31, 55, 57) and three females (ages 46, 49, 54). Seven patients proceeded to operation. Six tumours were removed successfully at laparotomy, one was malignant. There was no instance of synchronous multiple tumours.