UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No. 1)

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Harsco Corporation
350 Poplar Church Road
Camp Hill, PA 17011 USA
Phone: 717.763.7064
Fax: 717.763.6424
Web: www.harsco.com

Harsco Corporation

Annual Meeting of Shareholders — April 26^th

Please Vote Your Shares Today

April 13, 2011

Dear Harsco Shareholder:

We recently mailed to you proxy materials for our upcoming Annual Meeting of Shareholders to be held on April 26, 2011. According to our records, your shares have not been voted. Your vote is extremely important. Whether or not you plan to attend the Annual Meeting, we encourage you to vote your shares promptly.

Time is Short! Vote Your Shares!

With the Annual Meeting now only a short time away, please act today to be sure your vote is counted. You can vote by telephone, internet or mail. For your convenience, a duplicate proxy card and voting instruction form are enclosed.

If you have already voted, we thank you for your prompt response. (In the event that two proxies are received from you, the one bearing the latest date will be counted, as it automatically revokes all prior proxies). If you have not voted, we encourage you to do so without delay. Your vote is needed and valued, regardless of the number of shares you own.

Thank you for voting!

On behalf of the Board of Directors,

Mark E. Kimmel
Senior Vice President, Chief Administrative Officer,
General Counsel and Corporate Secretary

Enclosures

If you have questions or need assistance voting your shares, you should contact:

Morrow & Co., LLC

Brokers call collect: (203) 658-9400
Shareholders call toll free: (800) 662-5200