The One Country Two Systems Research Institute (OCTS; Chinese:一國兩制研究中心) is a Hong Kong think tank founded in 1990 by a group of pro-Beijing politicians. It is registered in Hong Kong as a private non-profit company with limited liability and has been granted the status of a public interest charitable organisation by the Government of Hong Kong. The OCTS is a non-governmental organisation specializing in Hong Kong's public policy.