EXHIBIT 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our reports included in, or incorporated by reference to, this Form 10-K into OSB Financial Corp.'s previously filed Registration Statement, File No. 33-52158. /s/ Wipfli Ullrich Bertelson LLP --------------------------------- Wipfli Ullrich Bertelson LLP Green Bay, Wisconsin March 6, 1997