Affonso Eduardo Reidy (Paris, 26 October 1909 - Rio de Janeiro, 10 August 1964) was a Brazilian architect.

He was the son of an English father and a Brazilian mother.

Reidy entered the Escola Nacional de Belas Artes in Rio de Janeiro at age 17.

He apprenticed with the French urban planner Alfred Agache (1875-1959) during his studies.

Lúcio Costa appointed him as a teaching assistant to the architect Gregori Warchavchik (1896-1972) at the Escola Nacional de Belas Artes in the same year.