Yvonne Cormeau, born Beatrice Yvonne Biesterfeld (18 December 1909 in Shanghai, China – 25 December 1997 in Fleet, Hampshire, England) was an agent of the United Kingdoms clandestine organization, the Special Operations Executive (SOE), during the Second World War.
She was the second female radio operator to be sent to occupied France and acclaimed for her work.
She once talked her way out of arrest by the Germans by pretending her wireless was an X-ray machine.
Cormeau worked in France from August 22, 1943 until September 25, 1944.