Jean Charles Rodolphe Radau (22 January 1835 – 21 December 1911) was a German astronomer and mathematician who worked in Paris at the Revue des deux Mondes for most of his life.
Radau was born in Angerburg, Province of Prussia (now Węgorzewo in Poland), and after studying in Königsberg and working on the Three-body problem, he moved to Paris to collaborate with other scientists.
Radau won the Prix Damoiseau of the French Academy of Sciences in 1892 working on planetary perturbations in the motion of the Moon.
A crater on Mars is named in Radau's honor.
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