Thérèse Maria Léonie Gendebien, known by the stage name Léo Marjane (26 August 1912 – 18 December 2016) was a French singer who reached the peak of her popularity in the late 1930s and early 1940s before her career went into sharp decline after the end of World War II.

Her early recordings – a mixture of original songs and standards of the era such as "Begin the Beguine" and "Night and Day" – were well received and popular.

She was accused of having appeared many times at venues frequented by German officers, and her numerous performances on German- and collaborator-controlled Radio Paris were also held against her.

Marjane maintained that she had been no more than naïve;[2] nevertheless, in the immediate aftermath of the end of World War II, the allegations and negative publicity in France led her to spend a period of time in England and Belgium, where she was largely unknown.

Subsequent to her retirement from public life, Marjane consistently shunned most requests for television, radio, or published media interviews.