The Onawa IOOF Opera House, also known as the Onawa Opera House, is a historic opera house located in Onawa, Iowa.

It was completed in November, 1900, only to be heavily damaged in a fire a month later, on December 24, 1900.

[2] It has been deemed historically significant as the building most strongly associated Onawa's "strong tradition of live-stage entertainment" from the late 1880s to the mid-1920s, involving three structures.

[2]: 12 It was listed on the National Register of Historic Places in 1990.

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