Having investigated suicide mortality among the 250,000 immigrant Finns in Sweden ("Finnish Swedes") 1982-1992, we have found it to be very high for both sexes. The mean overall rate was 48.2/100,000 a year--2.0 times the Swedish rate and 1.6 times the Finnish. Suicide mortality has, moreover, increased among women. A comparison of naturalized Finns (those who have become Swedish citizens) with those who have remained Finnish citizens does not demonstrate any conclusive relationship between naturalization and suicide for the group as a whole. In most male groups, those who had taken Swedish citizenship had clearly lower rates than those who had not. For most female groups, however, there was a reverse tendency. Further monitoring of the development of suicide mortality in the group is needed.