Pietro Redondi (born 1950) is an Italian historian of science, known for his work on Galileo Galilei.
In 1981-1992 he did research for the CNRS at the Centre Alexandre Koyré in Paris, and from 1985 to 1990 as deputy director.
Redondi is a professor at the Faculty of Psychology of the University of Milano-Bicocca.
In his 1983 book, Redondi developed a new approach to the trial of Galileo.
According to this approach, the main reason for his conviction as "vehemently suspected of heresy" was not his advocacy of the Copernican worldview, but his earlier conflict with the Jesuits in his book Il Saggiatore of 1623, in which he advocated an atomist theory of Democritus that ran counter to Aristotelian doctrines endorsed by Rome as well as the Catholic doctrine of the Eucharist.