This study compared the incidence of lung cancer among Puerto Ricans (PRs) with that of Whites, Blacks, and Hispanics in the United States. We computed age-standardized rates of lung cancer during 1992-2010 and percentages of change over time. Standardized rate ratios (SRR) were estimated to assess racial/ethnic and gender differences. All men groups showed a significant decline in lung cancer over time but PRs observed the smallest change (-1.2%). For both men and women, PRs had lower incidence rates compared to other racial/ethnic groups (SRR < 1; P < 0.05). Among all groups, men reported higher incidence rates than women but PRs showed the largest gender disparity (SRR = 2.29). This study showed that although PRs exhibited lower incidence rates of lung cancer, this subgroup of Hispanics faced an important burden of lung cancer, principally because PR men had the smallest decline over time and the largest gender difference among all groups.