ZNT Zenith National Insurance Corp.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported) April 21, 2010

ZENITH NATIONAL INSURANCE CORP.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (818) 713-1000

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o             Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o             Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o             Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o             Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.02.  Results of Operations and Financial Conditions.

On April 21, 2010, Zenith National Insurance Corp., the Registrant, issued a press release announcing its financial results for the quarter ended March 31, 2010.  The full text of the press release is attached hereto as Exhibit 99.1.

Item 9.01.  Financial Statements and Exhibits.

(a)  Not applicable

(b)  Not applicable

(c)  Not applicable

(d)  Exhibits

The following exhibit is furnished as part of this report:

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934 the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit Index

2