Jona Freiherr von Ustinov, often 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). His son was the actor Sir Peter Ustinov.
- Occupation
- diplomat, journalist, spy, aircraft pilot
- Citizenship
- United Kingdom, Germany
- Born
- December 2, 1892
- Died
- December 1, 1962
