| Honorific Prefix: | Professor |
| Sir Dillwyn Williams | |
| Office: | Professor of Histopathology, University of Cambridge |
| Term Start: | 1992 |
| Term End: | 1997 |
| Office2: | Professor of Pathology, Welsh National School of Medicine/University of Wales College of Medicine |
| Term Start2: | 1969 |
| Term End2: | 1992 |
| Birth Name: | Edward Dillwyn Williams |
| Birth Date: | 1 April 1929 |
| Occupation: | Histopathologist |
Sir Edward Dillwyn Williams (born 1 April 1929) is a British medical scientist and a Founding Fellow of the Learned Society of Wales.[1]