Research by the Global Burden of Disease Health Financing Collaborator Network produced retrospective health spending estimates for 1995-2018 for 204 countries and territories. They cover total health spending, health spending disaggregated by source into three domestic financing source categories, and development assistance for health (DAH). Domestic source data came primarily from the WHO’s Global Health Expenditure Database (GHED). DAH data came from diverse sources, including program reports, budget data, national estimates, and National Health Accounts (NHAs). The resulting estimates were used to forecast GDP and prospective health spending estimates for 2018-2050. Estimates are reported in constant 2020 United States dollars, constant 2020 purchasing power parity adjusted (PPP) dollars, and as a percent of gross domestic product.