Archivides "Archie" Kalokerinos (28 September 1927 – 1 March 2012) was an Australian physician and anti-vaccination advocate. He advocated for alternative medicine, including orthomolecular medicine and a form of megavitamin therapy in which high doses of vitamin C are used to treat nearly all ailments, including any virus. He became notable for treating indigenous Australians with high intravenous doses of vitamin C, a practice criticized by the medical community for being unsupported by data.