Anthony R. Cashmore (b. 22 Jan 1941) is a biochemist and plant molecular biologist, best known for identifying cryptochrome photoreceptor proteins. These specialized proteins are critical for plant development and play an essential role in circadian rhythms of plants and animals. A Professor emeritus in the Department of Biology at the University of Pennsylvania, Cashmore led the Plant Science Institute from the time of his appointment in 1986 until his retirement in 2011. He was elected to the National Academy of Sciences in 2003.