Sir Andrew Graham Gilchrist was a British Special Operations Executive operative who later served as the United Kingdom's Ambassador to Ireland, Indonesia, and Iceland during the Cold War.

Large-scale killings and civil unrest primarily targeting members of the Communist Party (PKI) were carried out in Indonesia from 1965 to 1966. Other affected groups included alleged communist sympathisers, Gerwani women, trade unionists, ethnic Javanese Abangan, ethnic Chinese, atheists, so-called "unbelievers", and alleged leftists in general. According to the most widely published estimates at least 500,000 to 1.2 million people were killed, with some estimates going as high as two to three million. The atrocities, sometimes described as a genocide or politicide, were instigated by the Indonesian Army under Suharto. Research and declassified documents demonstrate the Indonesian authorities received support from foreign countries such as the United States and the United Kingdom.