UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 1, 2015

KORN/FERRY INTERNATIONAL

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (310) 552-1834

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):

Explanatory Note

As previously reported, on December 1, 2015, Korn/Ferry International, a Delaware corporation (the “Company”), completed its acquisition (the “Acquisition”) of all the issued and outstanding shares and non-interest bearing convertible preferred equity certificates of HG (Luxembourg) S.à.r.l., a private limited liability company organized under the laws of Luxembourg (“HG Luxco”). Following the closing of the Acquisition, HG Luxco became an indirect wholly owned subsidiary of the Company. This Amendment No. 1 amends the Current Report on Form 8-K, filed December 2, 2015 (the “Initial Form 8-K”), to provide the financial statement information referred to in parts (a) and (b) of Item 9.01 below relating to the Acquisition. Except as otherwise noted, all other information in the Initial Form 8-K remains unchanged.

Item 9.01 Financial Statements and Exhibits.

(a) Financial Statements of Business Acquired.

The audited consolidated financial statements of HG Luxco, as of September 30, 2014 and 2013, and for each of the years in the two-year period ended September 30, 2014, and the related notes, as well as the Report of the Independent Auditors, KPMG LLP, with respect to such financial statements, are filed as Exhibit 99.1 hereto and incorporated herein by reference.

The unaudited interim condensed consolidated financial statements of HG Luxco, as of June 30, 2015 and 2014, and for the nine-month periods ended June 30, 2015 and 2014, and the related notes, are filed as Exhibit 99.2 hereto and incorporated herein by reference.

(b) Pro Forma Financial Information.

The following unaudited pro forma condensed combined financial statements of the Company, reflecting the acquisition of HG Luxco, are filed as Exhibit 99.3 hereto and incorporated herein by reference:

(d) Exhibits.

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