The Miami County Courthouse is an historic building in Troy, Ohio, United States.

Built from 1885 to 1888,[3] it was designed by noted Ohio (and later New York) architect Joseph W. Yost, who also designed the similar Belmont County Courthouse built at the same time in St. Clairsville.

It has high arched windows and Corinthian columns supporting the outthrust corners and main entrance.

The central pediment rests on an arch supported by Corinthian columns.

The corners of the building thrust out and support a pediment, on top of each rests a tower crowned with an urn-shaped finial.