Until 1974, Chinese had no de jure status as an official language of Hong Kong where the colonial government had often claimed to favour a laissez-faire approach to language planning. In the run-up to the resumption of Chinese sovereignty throughout the 1990s, official policy became more interventionist. From 1995, the stated policy of the government has been to promote a “biliterate” and “trilingual” society, and the use of Chinese as a medium of instruction in schools. Immediately after the change in sovereignty, Putonghua became a compulsory school subject. This paper examines the issue of language planning and policies both from a historical perspective and through a consideration of current policies and practice across the domains of government, law and education in Hong Kong.