Steyer Opera House is a historic building located in Decorah, Iowa, United States.

Its original owner and namesake was Joseph Steyer, who emigrated from Luxembourg in 1852 and settled in Decorah in 1865.

The walls and ceiling are covered with tin that is pressed in a variety of decorative patterns.

The balcony that rings the main floor on three sides of the auditorium was part of the 1875 renovation of the building.

This article about a property in Winneshiek County, Iowa on the National Register of Historic Places is a stub.