First National Bank is a historic building located in downtown Ottumwa, Iowa, United States.

It is significant for its architectural design and its use of terra cotta for the exterior, the only bank in town so clad.

The two-story structure features a pediment and two columns flanking the main entrance.

Initially, the building was a single story with 25-foot (7.6 m) ceilings, but it was altered to its present form in 1956.

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