Alan Ashworth, FRS (born 1960 in Bolton, Lancashire) is a British molecular biologist, noted for his work on genes involved in cancer susceptibility. He is currently the President of the UCSF Helen Diller Family Comprehensive Cancer Center at the University of California, San Francisco, a multidisciplinary research and clinical care organisation that is one of the largest cancer centres in the Western United States. He was previously CEO of the Institute of Cancer Research (ICR) in London.