Celso Grebogi FRSE (born 1947) is a Brazilian theoretical physicist who works in the area of chaos theory.
Currently he works at the University of Aberdeen as the "Sixth Century Chair in Nonlinear and Complex Systems".
He has done extensive research in the field of plasma physics before his work on the theory of dynamical systems.
He and his colleagues (Edward Ott and James A. Yorke) have shown with a numerical example that one can convert a chaotic attractor to any one of numerous possible attracting time-periodic motions by making only small time-dependent perturbations of an available system parameter.
Together with Miguel A. F. Sanjuán (Rey Juan Carlos University, Spain) he was the editor of the book Recent Progress In Controlling Chaos.