American Century International Bond Funds N-CSR Certified annual shareholder report (management investment company)

                                                              EXHIBIT 99.906CERT


     CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
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     In connection with the shareholder report of American Century International
Bond Funds (the "Registrant") on Form N-CSR for the period ending December 31,
2005 (the "Report"), we, the undersigned, certify, pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the requirements of Section 15(d) of
          the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Registrant.

Dated:  February 28, 2006


                                            /s/ William M. Lyons
                                            ------------------------------------
                                            William M. Lyons
                                            President
                                            (chief executive officer)


                                            /s/ Maryanne L. Roepke
                                            ------------------------------------
                                            Maryanne L. Roepke
                                            Sr. Vice President, Treasurer, and
                                            Chief Financial Officer
                                            (chief financial officer)