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Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the Registration Statements of Packaging Corporation of America (Form S-8 No. 333-33176 and Form S-8 No. 333-159576) of our reports dated February 21, 2012, with respect to the consolidated financial statements and schedule of Packaging Corporation of America and the effectiveness of internal control over financial reporting of Packaging Corporation of America, included in this Annual Report (Form 10-K) for the year ended December 31, 2011.
/s/ Ernst & Young LLP
Chicago, Illinois
February21, 2012