Demography involves the study of population patterns and processes, traditionally concentrated on the fields of fertility, mortality, and migration. The discipline has expanded well beyond these core fields, however, and encompasses at least two dozen subfields, including areas such as race and ethnicity and gender. Over the past decade, population research has increasingly incorporated the demography of sexuality, including a focus on the demographics of the LGBTQ population. This entry discusses the importance of studying the demographics of the LGBTQ population and provides an overview of related key findings.