CDC Nvest Funds Trust III
                            Exhibit to SEC Form N-CSR
                           Section 302 Certifications

I, Nicholas H. Palmerino, certify that:

   1. I have reviewed this report on Form N-CSR of CDC Nvest Funds Trust III;

   2. Based on my knowledge, this report does not contain any untrue statement
      of a material fact or omit to state a material fact necessary to make the
      statements made, in light of the circumstances under which such statements
      were made, not misleading with respect to the period covered by this
      report; and

   3. Based on my knowledge, the financial statements, and other financial
      information included in this report, fairly present in all materials
      respects the financial condition, results of operations, changes in net
      assets, and cash flows (if the financial statements are required to
      include a statement of cash flows), of the registrant as of, and for, the
      periods presented in this report;

   4. The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Rule 30a-2(c) under the Investment Company Act of 1940) for the
      registrant and have:

         a.  Designed such disclosure controls and procedures to ensure that
             material information relating to the registrant, including its
             consolidated subsidiaries, is made know to us by others within
             those entities, particularly during the period in which this report
             is being prepared;

         b.  Evaluated the effectiveness of the registrant's disclosure controls
             and procedures as of a date within 90 days prior to the filing of
             this report (the "Evaluation Date"); and

         c.  Presented in this report our conclusions about the effectiveness of
             the disclosure controls and procedures based on our evaluation as
             of the Evaluation Date;

   5. The registrant's other certifying officers and I have disclosed, based on
      our most recent evaluation, to the registrant's auditors and the audit
      committee of the registrant's board of directors (or persons performing
      the equivalent functions):

         a.  All significant deficiencies in the design or operation of internal
             controls which could adversely affect the registrant's ability to
             record, process, summarize and report financial data and have
             identified for the registrant's auditors any material weaknesses in
             internal controls; and

         b.  Any fraud, whether or not material, that involves management or
             other employees who have a significant role in the registrant's
             internal controls; and

   6. The registrant's other certifying officers and I have indicated in this
      report whether or not there were significant changes in internal controls
      or in other factors that could significantly affect internal controls
      subsequent to the date of our most recent evaluation, including any
      corrective actions with regard to the significant deficiencies and
      material weaknesses.

Date: February 25, 2004

                                            /s/ NICHOLAS H. PALMERINO
                                            -------------------------
                                            Nicholas H. Palmerino
                                            Treasurer



                            CDC Nvest Funds Trust III
                            Exhibit to SEC Form N-CSR
                           Section 302 Certifications

I, John T. Hailer, certify that:

     1.   I have reviewed this report on Form N-CSR of CDC Nvest Funds Trust
          III;

     2.   Based on my knowledge, this report does not contain any untrue
          statement of a material fact or omit to state a material fact
          necessary to make the statements made, in light of the circumstances
          under which such statements were made, not misleading with respect to
          the period covered by this report; and

     3.   Based on my knowledge, the financial statements, and other financial
          information included in this report, fairly present in all materials
          respects the financial condition, results of operations, changes in
          net assets, and cash flows (if the financial statements are required
          to include a statement of cash flows), of the registrant as of, and
          for, the periods presented in this report;

     4.   The registrant's other certifying officers and I are responsible for
          establishing and maintaining disclosure controls and procedures (as
          defined in Rule 30a-2(c) under the Investment Company Act of 1940) for
          the registrant and have:

               a.   Designed such disclosure controls and procedures to ensure
                    that material information relating to the registrant,
                    including its consolidated subsidiaries, is made know to us
                    by others within those entities, particularly during the
                    period in which this report is being prepared;

               b.   Evaluated the effectiveness of the registrant's disclosure
                    controls and procedures as of a date within 90 days prior to
                    the filing of this report (the "Evaluation Date"); and

               c.   Presented in this report our conclusions about the
                    effectiveness of the disclosure controls and procedures
                    based on our evaluation as of the Evaluation Date;

     5.   The registrant's other certifying officers and I have disclosed, based
          on our most recent evaluation, to the registrant's auditors and the
          audit committee of the registrant's board of directors (or persons
          performing the equivalent functions):

               a.   All significant deficiencies in the design or operation of
                    internal controls which could adversely affect the
                    registrant's ability to record, process, summarize and
                    report financial data and have identified for the
                    registrant's auditors any material weaknesses in internal
                    controls; and

               b.   Any fraud, whether or not material, that involves management
                    or other employees who have a significant role in the
                    registrant's internal controls; and

     6.   The registrant's other certifying officers and I have indicated in
          this report whether or not there were significant changes in internal
          controls or in other factors that could significantly affect internal
          controls subsequent to the date of our most recent evaluation,
          including any corrective actions with regard to the significant
          deficiencies and material weaknesses.

Date:  February 25, 2004

                                            /s/ JOHN T. HAILER
                                            ---------------------
                                            John T. Hailer
                                            President & Chief Executive Officer