Thomas Franklin Daniel (born September 14, 1954) is an American botanist, and teacher.
Between 1981 and 1985 he was an assistant curator of the Arizona State University Herbarium.
Since 1986, Daniel belongs to the California Academy of Sciences where he is Curator of Botany, Emeritus.
In 2009, he was president of the Botany Department, a position he also held between 1988 and 1990 and between 1994 and 1996.
Since 1998 he has been a research professor at San Francisco State University.