Captain Thomas Garth (10 December 1787 – November 1841) was a British naval commander during the Napoleonic Wars.
He was also a nephew of General Thomas Garth, Colonel of the first dragoons and Principal Equerry to George III.
In returning that fire, the frigate discharged from her carronades some shrapnel shells; one of which, bursting near the magazine of the fort, containing 3000 barrels of powder and a great quantity of cartridges, caused an explosion which killed 75 men.
In the spring of 1810, Thomas Garth was put under the orders of Sir George Cockburn who had been sent to Quiberon Bay to work with Baron De Kolli, who was trying to arrange the release of Ferdinand VII of Spain, held at Valençay.
They had two daughters one of whom, Charlotte Harriet Garth married Philip William Godsal of Iscoyd Park in Flintshire.