This paper quantifies the contribution of Helicobacter pylori to excess gastric cancer among Māori and Pacific men in New Zealand. The study researchers calculated age-standardised gastric cancer rate ratios for 1981–2004 in Māori and Pacific men as well as European/Other men born between 1926 and 1940 (Cohort One) and between 1941 and 1955 (Cohort Two). Analyses comparing these rate ratios with those restricted to H. pylori prevalent populations revealed that H. pylori contributed substantially to excess gastric cancer incidence in Māori men (50% in Cohort One and 61% in Cohort Two) and Pacific men (71% in Cohort One and 82% in Cohort Two).