Lieutenant-Colonel Robert Clerk (c.1720 – 1797) was a British engineer officer who served in the War of the Austrian Succession and the Seven Years' War. His report on the state of the defences of Rochefort (Rochefort, Charente-Maritime) in 1757 was the main reason for that French naval port being chosen as the target for a major British expedition, the Raid on Rochefort, for which Clerk was appointed chief engineer.