The purpose ofthis studywvas to examine the differences between international certification standards for ice hockey helmets. The American Society for Testing and Materials (ASTM), Canadian Standards Association (CSA) and International Organization Standards (ISO) protocols were compared. Only the impact testing methods at ambient temperatures were examined. Four helmet models, currently available to consumers, were used for testing. No significant differences (p<0.05) were found between the standards in a rank order comparison. Further analysis of differences, with peak linear accelerations separated by impact locations showed significant differences (p<0.05) between all standard, at five of the six defined impact sites, with no differences being found between standards at the rear site. Post-hoc painvise multiple comparisons also showed significant performance differences (p<0.05) between helmet models.