Howard Taylor Ricketts (February 9, 1871 – May 3, 1910) was an American pathologist after whom the Rickettsiaceae family and the Rickettsiales are named.He was born in Findlay, Ohio. In the early part of his career, Ricketts undertook research at Northwestern University on blastomycosis. He later worked in the Bitterroot Valley of Montana and at the University of Chicago on Rocky Mountain spotted fever.