Exhibit (b)(2)

                            CDC Nvest Funds Trust III
                            Section 906 Certification

     In connection with the report on Form N-CSR for the period ended December
31, 2003 for the Registrant (the "Report"), the undersigned each hereby
certifies to the best of his knowledge, pursuant to section 906 of the
Sarbanes-Oxely 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:
President & Chief Executive Officer                Treasurer
CDC Nvest Funds Trust III                          CDC Nvest Funds Trust III
-----------------------------------                -----------------------------

/s/JOHN T. HAILER                                  /s/NICHOLAS H. PALMERINO
-----------------                                  ------------------------
John T. Hailer                                     Nicholas H. Palmerino

Date:  February 25, 2004                           Date:  February 25, 2004

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 CDC Nvest Funds Trust III and
will be retained by the CDC Nvest Funds Trust III and furnished to the
Securities and Exchange Commission or its staff upon request.