Lesbian, gay, bisexual, transgender, and queer (LGBTQ+) older adults experience significant health disparities. Examining these disparities has become an international research priority, but gaps remain. In this review article, we summarize major contributions of and ongoing gaps in health disparities research among LGBTQ+ older adults, while focusing on four major content areas: (a) social determinants of health disparities, (b) mental, cognitive, and physical health disparities, (c) reproductive and sexual health disparities, and (d) seeking LGBTQ+-affirming and age-friendly care. Using a structural competency approach, we develop a four-part agenda for this research area that enhances our understanding of how macro-level systems, institutions, and structures drive health disparities among aging LGBTQ+ communities. We also outline future research on structural competency in LGBTQ+ older adult health, while providing recommendations for researchers and clinicians. These recommendations illuminate potential best practices for bettering the health and quality of life of LGBTQ+ older populations.