PURPOSE: To project the supply and demand of diagnostic radiologists in Korea. MATERIALS AND METHODS: With the year 2010 in mind, the 'in-and-out moves' method was applied in order to estimate the supply of diagnostic radiologists. We also used the health need approach and the physician population ratio method for the projection of demand. As sources of information, administrative and demographic statistics were analyzed. RESULTS: If the current situation in terms of the supply of newly qualified diagnostic radiologists is maintained, the projected number will be in short supply by as many as 790 in 2000 and by 370 in 2005. There will, however, be an oversupply of about 110 in 2010. CONCLUSION: To accomplish a balanced state of supply and demand in 2010, the numbers of newly qualifying diagnostic radiologists should be maintained at the current level.