Myxoma of the heart is a relatively rare benign growth usually involving the left atrium, but less often involving other chambers of the heart. Though several case reports on this entity have been published in Korea, as far as our knowledge is concerned. virtually all of them were myxoma of the left atrium and no report on the tumor of the right atrium can be found. In July. 1977, we experienced a case of myxoma of the left atrium, in a 23 years old female, and in October of the same year, we experienced a case of right atrial myxoma in a 42 years old male. Clinical data and histopathological findings of each case were discussed and a brief review of the literature on this entity was made.