GAVI, officially Gavi, the Vaccine Alliance (previously the GAVI Alliance, and before that the Global Alliance for Vaccines and Immunization) is a public–private global health partnership with the goal of increasing access to immunization in poor countries. In 2016, Gavi channeled more than half of total donor assistance for health, and most donor assistance for immunization, by monetary measure.

Gavi is a co-convener of COVAX, the vaccines pillar of the Access to COVID-19 Tools (ACT) Accelerator, together with the Coalition for Epidemic Preparedness Innovations (CEPI) and the World Health Organization (WHO). 

The Vaccine Alliance brings together developing country and donor governments, the World Health Organization, UNICEF, the World Bank, the vaccine industry, technical agencies, civil society, the Bill & Melinda Gates Foundation and other private sector partners.