Summary.Osteonecrosis is usually considered to be a minor and rare late sequelae of treatment for Hodgkin's Disease (HD). However, over ten years six patients out of a total of 53 patients treated for HD at the haematology department of a district general hospital developed osteonecrosis, an incidence of 11.3%. Routine isotope bone scanning of patients produced two further asymptomatic cases. These results suggest a higher incidence than previously suspected of a problem which caused our patients considerable morbidity. Further measures are required to identify and adequately treat a significant cause of late morbidity following chemotherapy for HD.