EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 33-93934, No. 333-62338) and Form S-8 (No. 33-77237, No. 33-83304, No. 333-62346, No. 333-104870, No. 333-122745) of Rock-Tenn Company of our report dated April 27, 2005 relating to the financial statements of the Paperboard and Packaging Divisions of Gulf States Paper Corporation, which appear in the Current Report on Form 8-K of Rock-Tenn Company dated June 10, 2005. /s/ PricewaterhouseCoopers Atlanta, Georgia August 22, 2005