On May 29, 2009, Zenith Insurance Company and ZNAT Insurance Company (collectively, "Zenith Insurance"), wholly owned subsidiaries of Zenith National Insurance Corp., the Registrant, entered into a Workers' Compensation and Employer's Liability Excess of Loss Reinsurance Contract (the "Contract") for their first layer of reinsurance coverage of workers' compensation and employers liability losses.

The Contract was entered into with a consortium of reinsurers composed of Aspen Insurance UK Limited, Hannover Rückversicherung AG, Lloyd's Underwriter Syndicate No. 2987 BRT, Odyssey America Reinsurance Corporation, Partner Reinsurance Company of the U.S. and Swiss Reinsurance America Corporation (with Guy Carpenter & Company, LLC acting as Intermediary with respect to certain of the reinsurers).

The terms of the Contract are substantially similar to the reinsurance coverage provided under a contract with Swiss Reinsurance America Corporation, which is no longer in effect for losses occuring after April 30, 2009. Losses on and after May 1, 2009 are covered by the Contract, under which Zenith Insurance continues to retain the first $5 million of each loss and the consortium of reinsurers provides $5 million of reinsurance coverage (subject to an aggregate annual limit of $25 million) for each loss in excess of the retained $5 million.

A copy of the Contract is attached to this Current Report on Form 8-K as Exhibit 10.1 and it is incorporated herein by reference.

(d) Exhibits

The following exhibit is filed as part of this current report:

Number                                    Exhibit
 10.1     Workers' Compensation and Employer's Liability Excess of Loss
          Reinsurance Contract Effective May 1, 2009