Croswell Opera House
| Adrian Union Hall-Croswell Opera House | |
| Location | 129 East Maumee Street Adrian, Michigan | 
|---|---|
| Coordinates | 41°53′55″N 84°02′09″W / 41.89861°N 84.03583°W | 
| Built | 1866 | 
| Architect | H.N. White (1866); John C. Brompton (1919 and 1921) | 
| Part of | Downtown Adrian Commercial District | 
| NRHP reference No. | 85000839 | 
| Significant dates | |
| Added to NRHP | April 18, 1985 | 
| Designated MSHS | March 2, 1976 | 
The Croswell Opera House is a historic theater located at 129 East Maumee Street in Adrian, Michigan. It is recognized as the oldest theater in the state and among the oldest continuously operating theaters in the United States. The theater was designated as a Michigan Historic Site on March 2, 1976 and later added to the National Register of Historic Places as the Adrian Union Hall-Croswell Opera House on April 18, 1985.