LeRoy Larson collection. Mills Music Library, University of Wisconsin-Madison. Includes photocopies of some of Otto's music manuscripts with annotations by Larson.

Robert Andresen collection. Center for the Study of Upper Midwestern Cultures. University of Wisconsin-Madison.

Helene Stratman-Thomas Collection. Mills Music Library, University of Wisconsin-Madison.

Otto Rindlisbacher's stuffed animals and musical instruments are held by the Wisconsin State Historical Society.

The Vesterheim Norwegian-American Museum Archives holds a manuscript collection containing mostly photocopies of Otto and Iva's correspondence, scrapbook pages, and sheet music.