Jona, Baron von Ustinov (Russian: ???? ?????????? ???????, romanized: Iona Platonovich Ustinov; 2 December 1892 – 1 December 1962), also known as Klop Ustinov (???? ???????), was a German journalist and diplomat who worked for MI5 during the time of the Nazi regime.
His father was the Russian-born emigre Baron Plato von Ustinov (1840–1918).