- Form 13F Holdings Report (13F-HR)

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 13F

FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 2011

Check here if Amendment [_]; Amendment Number: _____
This Amendment (Check only one.): [_] is a restatement.
[_] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name: Mizuho Financial Group, Inc.
Address: Marunouchi 2-Chome Building
 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Japan 100-8333

Form 13F File Number: 28-14124

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name : Tetsuo Iimori
Title : Executive Officer General Manager of Corporate Planning Phone : 81-3-5224-2789

Signature, Place, and Date of Signing:

/s/ Tetsuo Iimori Chiyoda-ku, Tokyo Japan April 14, 2011
----------------- ----------------------- -----------------
[Signature] [City, State] [Date]

Report Type (Check only one.):

[X] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
are reported in this report.)

[ ] 13F NOTICE. (Check here if no holdings reported are in this report, and all
holdings are reported by other reporting manager(s).)

[ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this
reporting manager are reported in this report and a portion are reported by
other reporting manager(s).)

FORM 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers: 0
 --------------
Form 13F Information Table Entry Total: 2
 --------------
Form 13F Information Table Value Total: $618,404
 --------------
 (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

None.

 FORM 13F INFORMATION TABLE

---------------------------------------------------------------------------------------------------------------------------------
 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
------------------------ -------- ---------- -------- --------------------- ---------- ---------- --------------------------
 TITLE VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
 NAME OF ISSUER OF CLASS CUSIP (X$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE
---------------------------------------------------------------------------------------------------------------------------------
BLACKROCK INC COM 09247X101 616,595 3,067,485 SH SOLE 3,067,485 0 0
CME GROUP INC COM 12572Q105 1,809 6,000 SH SOLE 6,000 0 0

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