University of Arkansas William Robert Horsfall (11 January 1907 - 18 November 1998) was an American entomologist who was a professor of medical entomology at the University of Illinois at Urbana-Champaign and a specialist on mosquitoes particularly in the genus Aedes.
Horsfall was born in Mountain Grove, Missouri to Frank and Margaret Uaulx.
His father was president of a college that is now the University of Arkansas at Monticello while his mother served as dean of women there.
During World War II he commanded the 17th Malaria Survey Unit in the South Pacific and was discharged with the rank of lieutenant colonel.
[1] He was elected in 1964 a fellow of the American Association for the Advancement of Science[2] Among his works was a comprehensive bibliography of medical entomology (which included Russian sources).