Queen's Harbour Master

In the United Kingdom, a Queen's (or King's) Harbour Master is a public official with the duty of keeping the port secure for both military and civilian shipping.

There are three Queen's Harbour Masters in the UK, one for each of the major naval ports of the UK: the Clyde Dockyard Port of Gareloch and Loch Long in the Firth of Clyde, the Dockyard Port of Portsmouth in Portsmouth, and the Dockyard Port of Plymouth in Plymouth.

The powers of the Queen's Harbour Masters originate in the Dockyard Ports Act 1865. Although legislation does not require it, most QHMs are serving officers in the Royal Navy.

The Queen's Harbour Master has their own flag, consisting of a Union Flag with a white circle on it, within which there is a crown and the letters "QHM".

In Canada
Equivalent positions also exist in Canada, where a Queen's Harbourmaster is known in French as capitaine de port de Sa Majesté (literally "Her Majesty's Captain of the Port").