Joseph Warren Yost (1847–1923) was a prominent architect from Ohio whose works included many courthouses and other public buildings. Some of his most productive years were spent as a member of the Yost and Packard partnership with Frank Packard. Later in his career he joined Albert D'Oench at the New York City based firm D'Oench & Yost. A number of his works are listed for their architecture in the U.S. National Register of Historic Places (NRHP).