HMS Mecklenburgh was a 6-gun single-masted cutter of the Royal Navy, purchased in 1763 during the last days of the Seven Years' War with France and assigned to coastal patrol offshore from Sussex.

Mecklenburgh was one of thirty cutters purchased by the Royal Navy in a three-month period from December 1762 to February 1763, for coastal duties off English ports.

[1] The function of these purchased cutters included convoy and patrol, the carrying of messages between Naval vessels in port and assisting the press gang in the interception of merchant craft.

[1] On 12 February 1763 the newly purchased cutter was sailed to Sheerness Dockyard for fitting out as a Navy craft.

[1] War with France ended on 10 February 1763, after Mecklenburgh's purchase but before completion of her fitout or assembling of her crew.