Exhibit 10.21

March 26, 2010

Bank of America, N.A.,

as Administrative Agent for the Lenders

WAl-501-17-32

800 5th Avenue Floor 17

Seattle WA 98104



| | Re: | Credit Agreement dated as of February 25, 2010 among Diamond Foods, Inc., a Delaware corporation (the Borrower), each lender from time to time
party thereto (collectively, the Lenders and individually, a Lender) and Bank of America, N.A., as administrative agent (in such capacity, the Administrative Agent) (as amended, restated,
supplemented or otherwise modified from time to time, the Credit Agreement). All capitalized terms used but not otherwise defined herein shall have the meanings set forth in the Credit Agreement.
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Ladies and Gentlemen:

The
Borrower has consummated the Equity Issuance pursuant to that certain prospectus supplement filed with the SEC on or about March 8, 2010 (such Equity Issuance, the March 2010 Equity Issuance) with proceeds (net of the
underwriters discount) of the March 2010 Equity Issuance totaling approximately $181.4 million. The Borrower hereby requests that the Lenders agree to amend (A) the definition of Excluded Issuance, as set forth in
Section 1.01 of the Credit Agreement to specifically include the March 2010 Equity Issuance, (B) the definition of foreign Security Documents, as set forth in Section 1.01 of the Credit Agreement by inserting
, any foreign guaranty agreements after charges, (C) the definition of Secured Hedge Agreement as set forth in Section 1.01 of the Credit Agreement by inserting , commodity Swap
Contract, after any interest rate Swap Contract and (D) Section 7.02(c) of the Credit Agreement to permit investments by Foreign Subsidiaries in other Foreign Subsidiaries.

Accordingly, upon execution of this letter agreement by the Required Lenders, and notwithstanding any provision of the Credit Agreement
or any other Loan Document to the contrary, you hereby agree that, effective as of February 25, 2010, the Credit Agreement is hereby amended as follows: (1) clause (c) of the definition of the Excluded Issuance in the
Credit Agreement is hereby amended and restated in its entirety to read the Equity Issuance made pursuant to that certain prospectus supplement filed with the SEC on or about March 8, 2010, (2) the definition of Foreign
Security Documents is hereby amended to insert , any foreign guaranty agreements after the word charges, (3) the definition of Secured hedge Agreement is hereby amended to insert , commodity Swap
Contract, after the phrase any interest rate Swap Contract and (4) the following new clause (v) is inserted at the end of Section 7.02(c): and (v) Investments by any Foreign Subsidiary (that is not
a Loan Party) in any other Foreign Subsidiary.

This letter agreement may be executed in counterparts with each counterpart constituting
an original and all of the counterparts, once executed, constituting but one original. Except as expressly provided herein, the Credit Agreement and the other Loan Documents shall remain unmodified and in full force and effect. This letter agreement
shall constitute a Loan Document.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



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DIAMOND FOODS, INC., as BorrowerBy:

/s/ Steven M. NeilName:

Steven M. NeilTitle:

Executive Vice President, Chief Financialand Administrative Officer




Diamond
Foods, Inc.

Amendment

Signature Pages



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Accepted and Agreed:BANK OF AMERICA, N.A., as Administrative AgentBy:

/s/ Ken PuroName:

Ken PuroTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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Accepted and Agreed:BANK OF AMERICA, N.A., as LenderBy:

/s/ Ronald J. DrobnyName:

Ronald J. DrobnyTitle:

Senior Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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BARCLAYS BANK, PLC, as a LenderBy:

/s/ Ritam BhallaName:

Ritam BhallaTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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COÖPERATIEVE CENTRALE RAIFFEISEN-BOERENLEENBANK B.A. RABOBANKNEDERLAND NEW YORK BRANCH, as aLenderBy:

/s/ Deborah DiasName:

Deborah DiasTitle:

Executive DirectorBy:

/s/ Rebecca O. MorrowName:

Rebecca O. MorrowTitle:

Executive Director




Diamond
Foods, Inc.

Amendment

Signature Pages



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SUNTRUST BANK, as a LenderBy:

/s/ Gabe BonfieldName:

Gabe BonfieldTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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HSBC BANK, as a LenderBy:

/s/ Katherine WolfeName:

Katherine WolfeTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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COBANK, ACB, as a LenderBy:

/s/ Hal NelsonName:

Hal NelsonTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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BANK OF THE WEST, as a LenderBy:

/s/ Casey GartenName:

Casey GartenTitle:

Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages



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KEYBANK NATIONAL ASSOCIATION, as aLenderBy:

/s/ Marianne T. MeilName:

Marianne T. MeilTitle:

Sr. Vice President




Diamond
Foods, Inc.

Amendment

Signature Pages