Roman Czerniawski (b. 1910) was a Polish Air Force Captain and Allied double agent during World War II.

As a former officer of the Polish Air Force, he volunteered to create an allied espionage network in France in 1940. This network was code-named Interallie . Among the other members of the network was Mathilde Carré.

On November 17, 1941, the Abwehr group of Hugo Bleicher arrested Carré and many other members of the Interallie and Carré revealed most of the members of the network. Czerniawski and others were imprisoned.

After having been offered safety by the Nazis, he was sent as an agent to England. However, he briefed the British and Polish authorities about the security lapses of his organization in France. He was turned into a double agent using the covername Brutus with the Double Cross System. He thus played a major part in the allied deception prior to the D-Day landing in Normandy in 1944.