Sir Melvyn Francis Greaves (born 12 September 1941) is a British cancer biologist, and Professor of Cell Biology at the Institute of Cancer Research (ICR) in London.

[2][3] Greaves initially trained in zoology and immunology, earning a PhD degree in 1968 from University College London.

[citation needed] In the mid-1970s his research turned to leukaemia, an interest he attributes to a tour of Great Ormond Street Hospital.

He worked at the Imperial Cancer Research Fund laboratories at Lincoln's Inn Fields (now part of the Francis Crick Institute) before moving to the ICR in 1984.

[4] At the ICR he served as Director of the Leukaemia Research Fund's Centre for Cell and Molecular Biology of Leukaemia from 1984-2003, and launched the Centre for Cancer Evolution in 2013.