Yves Delage (13 May 1854 – 7 October 1920) was a French zoologist known for his work into invertebrate physiology and anatomy.

He is also famous for noting and preparing a speech on the Turin Shroud, arguing in favour of its authenticity.

Delage estimated the probability that the image on the shroud was not caused by the body of Jesus Christ as 1 in 10 billion.

Delage performed influential experiments on the fertilization of sea urchin egg.

[3] He was elected an International Member of the American Philosophical Society in 1905.