EX-99.77Q1 OTHR EXHB

                                 CERTIFICATIONS
                                 --------------


I, John F. Cogan, Jr., certify that:

1. I have reviewed this report on Form N-SAR of Pioneer Mid Cap Value Fund;

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;

3. Based on my knowledge, the financial information included in this report, and
   the financial statements on which the financial information is based, fairly
   present in all material 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) 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 known 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 date 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 operations 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 or our most recent evaluation, including any corrective actions
   with regard to significant deficiencies and material weaknesses.

Date:  December 27, 2002                               /s/ John F. Cogan, Jr.
                                                      John F. Cogan, Jr.
                                                      President






                                 CERTIFICATIONS
                                 --------------


I, Vincent Nave, certify that:

1. I have reviewed this report on Form N-SAR of Pioneer Mid Cap Value Fund;

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;

3. Based on my knowledge, the financial information included in this report, and
   the financial statements on which the financial information is based, fairly
   present in all material 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) 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 known 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 date 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 operations 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 or our most recent evaluation, including any corrective actions
   with regard to significant deficiencies and material weaknesses.

Date:  December 27, 2002                               /s/ Vincent Nave
                                                      Vincent Nave
                                                      Treasurer

EX-99.J OTHER OPININ

Report of Independent Auditors


To the Board of Trustees and Shareowners of
Pioneer Mid Cap Value Fund

In planning and performing our audit of the financial statements
of the Pioneer Mid Cap Value Fund for the year ended October 31,
2002, we considered its internal control, including control
activities for safeguarding securities, in order to determine our
auditing procedures for the purpose of expressing our opinion on
the financial statements and to comply with the requirements of
Form N-SAR, not to provide assurance on internal control.

The management of the Pioneer Mid Cap Value Fund is responsible
for establishing and maintaining internal control.  In fulfilling
this responsibility, estimates and judgments by management are
required to assess the expected benefits and related costs of
controls.  Generally, controls that are relevant to an audit
pertain to the entity's objective of preparing financial statements
for external purposes that are fairly presented in conformity
with accounting principles generally accepted in the United States.
Those controls include the safeguarding of assets against
unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or
fraud may occur and not be detected.  Also, projection of any
evaluation of internal control to future periods is subject
to the risk that it may become inadequate because of changes
in conditions or that the effectiveness of the design and operation
may deteriorate.

Our consideration of internal control would not necessarily
disclose all matters in internal control that might be material
weaknesses under standards established by the American Institute
of Certified Public Accountants. A material weakness is a
condition in which the design or operation of one or more of the
internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud in
amounts that would be material in relation to the financial statements
being audited may occur and not be detected within a timely period by
employees in the normal course of performing their assigned functions.
However, we noted no matters involving internal control and its
operation, including controls for safeguarding securities, that we
consider to be material weaknesses as defined above as of October
31, 2002.

This report is intended solely for the information and use of
management and the Board of Trustees of the Pioneer Mid Cap Value
Fund and the Securities and Exchange Commission and is not intended
to be and should not be used by anyone other than these specified
parties.


ERNST & YOUNG LLP
Boston, Massachusetts
December 12, 2002