Age-specific cancer death rates for Polish migrants to the United States have been compared with the experience reported for Poland and U.S. native whites. The site-specific displacements in mortality for migrants from those recorded in home and host countries were in general accord with results previously published for 6 other ethnic groups in the United States. Polish migrants continued to display the high stomach cancer risks characteristic of Poland. The low mortality from cancer of the breast, colon, and rectum in Poland directed attention to the upward displacement of risks for these sites among migrants to the level prevailing among U.S. native whites, a sharp contrast to the picture presented for stomach. The death rates for cancer of the esophagus and larynx among male migrants exceeded those prevailing in both countries. The Poles deviated from the pattern for lung cancer set by other ethnic groups, the risks for male migrants following esophagus and larynx in displaying rates higher than those for both native Poles and U.S. native whites, rather than assuming a position intermediate to home and host country.