Adu Celso-Santos (born Eduardo Celso Santos, 7 August 1945 - 6 February 2005) was a Brazilian professional motorcycle road racer.

He was the first Brazilian to compete in Grand Prix motorcycle racing.

Celso-Santos was popular on the Grand Prix circuit during first half of the 1970s.

In the 1973 Grand Prix season, he gained his only victory in a race counting for world championship points when he won the 350cc class at the Spanish Grand Prix held at the Jarama Circuit.

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