Exhibit (b)(1)

                            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:    August 28, 2003
                                            /s/ John T. Hailer
                                            ---------------------------
                                            John T. Hailer
                                            President & Chief Executive Officer



                            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:    August 28, 2003

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