Exhibit (b)

                             Loomis Sayles Funds II
                            Section 906 Certification

        In connection with the report on Form N-CSR for the period ended
September 30, 2005 for the Registrant (the "Report"), the undersigned each
hereby certifies to the best of his knowledge, pursuant to section 906 of the
Sarbanes-Oxley Act of 2002, that:

        1. the Report complies with the requirements of Section 13(a) or 15(d)
of the Securities and Exchange Act of 1934, as applicable; and

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

By:                                        By:
Chief Executive Officer                    Treasurer
Loomis Sayles Funds II                     Loomis Sayles Funds II

/s/ Robert J. Blanding                     /s/ Michael C. Kardok
Robert J. Blanding                         Michael C. Kardok

Date: November 28, 2005                    Date: November 28, 2005

A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906, has been provided to the Loomis Sayles Funds II, and
will be retained by the Loomis Sayles Funds II and furnished to the Securities
and Exchange Commission (the "Commission") or its staff upon request.