Report of Independent Registered Public Accounting Firm

To the Members and Board of Managers
NB Private Markets Fund III (Master) LLC:

In planning and performing our audit of the financial statements of NB Private
Markets Fund III (Master) LLC (the Company) as of and for the year ended
March 31, 2023, in accordance with the standards of the Public Company
Accounting Oversight Board (United States), we considered the Company's internal
control over financial reporting, including controls over safeguarding
securities, as a basis for designing our auditing procedures for the purpose of
expressing our opinion on the financial statements and to comply with the
requirements of Form N-CEN, but not for the purpose of expressing an opinion on
the effectiveness of the Company's internal control over financial reporting.
Accordingly, we express no such opinion.

Management of the Company is responsible for establishing and maintaining
effective internal control over financial reporting. In fulfilling this
responsibility, estimates and judgments by management are required to assess
the expected benefits and related costs of controls. A company's internal
control over financial reporting is a process designed to provide reasonable
assurance regarding the reliability of financial reporting and the
preparation of financial statements for external purposes in accordance with
generally accepted accounting principles. A company's internal control over
financial reporting includes those policies and procedures that
(1) pertain to the maintenance of records that, in reasonable detail, accurately
and fairly reflect the transactions and dispositions of the assets of the
company; (2) provide reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in accordance with
generally accepted accounting principles, and that receipts and expenditures of
the company are being made only in accordance with authorizations of management
and directors of the company; and (3) provide reasonable assurance regarding
prevention or timely detection of unauthorized acquisition, use or disposition
of a company's assets that could have a material effect on the financial
statements.

Because of its inherent limitations, internal control over financial reporting
may not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may
become inadequate because of changes in conditions, or that the degree of
compliance with the policies or procedures may deteriorate.

A deficiency in internal control over financial reporting exists when the design
or operation of a control does not allow management or employees, in the normal
course of performing their assigned functions, to prevent or detect
misstatements on a timely basis. A material weakness is a deficiency, or
combination of deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement of the
Company's annual or interim financial statements will not be prevented or
detected on a timely basis.

Our consideration of the Company's internal control over financial reporting was
for the limited purpose described in the first paragraph and would not
necessarily disclose all deficiencies in internal control that might be material
weaknesses under standards established by the Public Company Accounting
Oversight Board (United States). However, we noted no deficiencies in the
Company's internal control over financial reporting and its operation, including
controls over safeguarding securities that we consider to be a material weakness
as defined above as of March 31, 2023.


This report is intended solely for the information and use of management and the
Board of Managers of NB Private Markets Fund III (Master) LLC and the
Securities and Exchange Commission and is not intended to be and should not be
used by anyone other than these specified parties.




/s/KPMG LLP

Boston, Massachusetts
May 26, 2023