Remo Ruffini (born May 17, 1942, La Brigue, Alpes-Maritimes, at that time, Briga Marittima, Italy) is an Italian astrophysicist.

After obtaining his degree in 1966 in Rome, he was a post-doctoral fellow at the Mainz Academy of Sciences working with Pascual Jordan, in West Germany.

[4] With Demetrios Christodoulou he has given the formula for a Kerr-Newmann Black Hole endowed of charge, mass and angular momentum.

With his student Robert Leach,[7] he used such an upper limit for fixing the paradigm which enabled the identification of the first Black Hole in the Milky Way Galaxy, Cygnus X1, using the splendid data of the Uhuru satellite by Riccardo Giacconi and his group.

[10] With his students Calzetti, Giavalisco, Song and Taraglio, Ruffini developed the role of fractal structures in cosmology.