Hong Kong was a British colony and later a British Dependent Territory from 1841 to 1997, apart from a period of Japanese occupation from 1941 to 1945 during the Pacific War. The colonial period began with the British occupation of Hong Kong Island in 1841, during the First Opium War between the British and the Qing dynasty. The Qing had wanted to enforce its prohibition of opium importation within the dynasty that was being exported mostly from British India and was causing widespread addiction among the populace.

The British Overseas Territories (BOTs) are the 14 territories with a constitutional and historical link with the United Kingdom that, while not forming part of the United Kingdom itself, are part of its sovereign territory. The permanently inhabited territories are delegated varying degrees of internal self-governance, with the United Kingdom retaining responsibility for defence, foreign relations and internal security, and ultimate responsibility for good governance. All of the territories are inhabited by civilians, except three that are chiefly or only inhabited by military or scientific personnel. All fourteen have the British monarch as head of state. These UK government responsibilities are assigned to various departments of the Foreign, Commonwealth and Development Office and are subject to change.