John Edmund Duggan was a member of the Queensland Legislative Assembly. He was the Deputy Premier of Queensland from 1953 until 1957 and Leader of the Opposition of Queensland from 1958 until 1966.

The deputy premier of Queensland is a role in the Government of Queensland assigned to a responsible Minister in the Australian state of Queensland. It has second ranking behind the premier of Queensland in Cabinet, and its holder serves as acting premier during the absence or incapacity of the premier. The deputy premier may either be appointed by the premier during the cabinet formation process or may be elected by caucus; during periods of Coalition government, the leader of the junior coalition partner is usually automatically selected for the role. Due to the contingent role of the deputy premier, they almost without exception always have additional ministerial portfolios.