Charles Arbuthnot (14 March 1767 – 18 August 1850) was a British diplomat and Tory politician. He was Ambassador to the Ottoman Empire between 1804 and 1807 and held a number of political offices. He was a good friend of the Duke of Wellington. His second wife, Harriet, became a hostess at Wellington's society dinners, and wrote an important diary cataloguing contemporary political intrigues.