Admiral George Cadogan, 3rd Earl Cadogan, CB, KMT (5 May 1783 – 15 September 1864) was a British Royal Navy officer and politician of the mid-nineteenth century who first gained fame for his service in the Adriatic campaign of the Napoleonic Wars in command of HMS Havannah. Cadogan later served as aide-de-camp to successive British monarchs and received promotion to full admiral.