Admiral of the Fleet James Gambier, 1st Baron Gambier, GCB (13 October 1756 – 19 April 1833) was a Royal Navy officer. After seeing action at the capture of Charleston during the American Revolutionary War, he saw action again, as captain of the third-rate HMS Defence, at the battle of the Glorious First of June in 1794, during the French Revolutionary Wars, gaining the distinction of commanding the first ship to break through the enemy line.