Hanna Building, Office building in Playhouse Square, Cleveland, US

The Hanna Building is a 16-story, 194-foot high-rise at the corner of East 14th Street and Euclid Avenue in Cleveland's Theater District. It sits oblong to the street grid, running parallel to both Euclid Avenue and East 14th Street, and carries news tickers, billboards and decorative elements shared with the other theatrical buildings of Playhouse Square. It remains an office building, while its annex holds the cabaret-style Hanna Theater.

The building was completed in 1921 by architect Charles A. Platt during a period of rapid commercial growth in downtown Cleveland following World War I. This construction coincided with the city's transformation into a thriving business center.

The Hanna Building takes its name from Mark Hanna, the Ohio senator and Cleveland businessman who died in 1904; his family invested in the skyscraper bearing his name. Its annex holds the Hanna Theater, a cabaret-style venue of the Great Lakes Theater Festival, and since 2014 the annex has also contained 102 apartments.

The building continues to serve as office space with retail shops on the ground floor and a connection to the adjacent Hanna Theater. Visitors can view the public areas and exterior architecture freely at any time.

The Hanna Annex holds the Hanna Theater, a cabaret-style venue of the Great Lakes Theater Festival. In 2012 the K & D Group announced the annex would be converted into 102 apartments, completed in 2014, facing Prospect Avenue with views south over Playhouse Square and west toward downtown.