Michael J. Whelan HonFRMS FRS (born 2 November 1931) is a British scientist. He and Archibald Howie won the 1988 Hughes Medal of the Royal Society "for their contributions to the theory of electron diffraction and microscopy, and its application to the study of lattice defects in crystals". He also received the 1998 Distinguished Scientist Award in Physical Sciences from the Microscopy Society of America and the 1965 C.V. Boys Prize from the Institute of Physics.
As of 2011, Whelan is Emeritus Professor in the Department of Materials at the University of Oxford, England, and an Emeritus Fellow of Linacre College, Oxford.