The Treatment Action Campaign (TAC) is a South African HIV/AIDS activist organisation which was co-founded by the HIV-positive activist Zackie Achmat in 1998. TAC is rooted in the experiences, direct action tactics and anti-apartheid background of its founder. TAC has been credited with forcing the reluctant government of former South African President Thabo Mbeki to begin making antiretroviral drugs available to South Africans.

Social and political activism to raise awareness about HIV/AIDS, as well as to raise funds for effective treatment and care of people with AIDS (PWAs), has taken place in multiple nations across the world since the 1980s. As a disease that began in marginalized populations, efforts to mobilize funding, treatment, and fight discrimination have largely been dependent on the work of grassroots organizers directly confronting public health organizations as well as politicians, drug companies, and other institutions.