Sir John Pope Hennessy, was an Irish and British politician and colonial administrator who served as the eighth Governor of Hong Kong and the fifteenth Governor of Mauritius.

The governor of Hong Kong was the representative of the British Crown in Hong Kong from 1843 to 1997. In this capacity, the governor was president of the Executive Council and commander-in-chief of the British Forces Overseas Hong Kong. The governor's roles were defined in the Hong Kong Letters Patent and Royal Instructions. Upon the end of British rule and the handover of Hong Kong to China in 1997, most of the civil functions of this office went to the chief executive of Hong Kong, and military functions went to the commander of the People's Liberation Army Hong Kong Garrison.