Delfino Codazzi (7 March 1824 in Lodi – 21 July 1873 in Pavia) was an Italian mathematician.
He graduated in mathematics at the University of Pavia, where he was a pupil of Antonio Bordoni.
For a long period Codazzi taught first at the Ginnasio Liceale of Lodi, then at the liceo of Pavia.
In 1865, he was appointed professor of complementary algebra and analytic geometry at University of Pavia.
He also obtained results concerning isometric lines, geodesic triangles, equiareal mapping and the stability of floating bodies.