Joseph Warren Yost (1847–1923) was a prominent architect from Ohio whose works included many courthouses and other public buildings.

A number of his works are listed for their architecture in the U.S. National Register of Historic Places (NRHP).

Yost began architectural studies in 1869 under the direction of Joseph Fairfax, an architect from Wheeling, West Virginia.

Yost made a decision in 1882 to move his firm to Columbus with the hope of more lucrative contracts.

Two buildings listed on the National Register of Historic Places (NRHP) are credited to the firm: Yost died in Avalon, Pennsylvania at the age of 76.