REPORT OF INDEPENDENT REGISTERED PUBLIC
ACCOUNTING FIRM


To the Board of Trustees of Mutual Fund Series Trust
and the Shareholders of Catalyst/Millburn Dynamic
Commodity Strategy Fund, Catalyst/Warrington Strategic
Program Fund, Catalyst Systematic Alpha Fund,
Catalyst/Teza Algorithmic Allocation Fund, Catalyst Multi-
Strategy Fund, EAVOL NASDAQ-100 Volatility Overlay Fund,
Catalyst/Millburn Hedge Strategy Fund, and Catalyst
Buffered Shield Fund

In planning and performing our audits of the financial statements
of Catalyst/Millburn Dynamic Commodity Strategy Fund
(formerly, Catalyst Hedged Commodity Strategy Fund),
Catalyst/Warrington Strategic Program Fund, Catalyst
Systematic Alpha Fund, Catalyst/Teza Algorithmic Allocation
Fund (formerly, Catalyst/Teza Algorithmic Allocation Income
Fund), Catalyst Multi-Strategy Fund, EAVOL NASDAQ-100
Volatility Overlay Fund (formerly, Catalyst/Exceed Defined Risk
Fund), Catalyst/Millburn Hedge Strategy Fund, and Catalyst
Buffered Shield Fund (formerly, Catalyst/Exceed Defined Shield
Fund), each a series of shares of beneficial interest in Mutual
Fund Series Trust (the "Funds"), as of June 30, 2021, and for
the year then ended, in accordance with the standards of the
Public Company Accounting Oversight Board (United States)
("PCAOB"), we considered the Funds' 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 Funds' internal control over financial
reporting.  Accordingly, we express no such opinion.

The management of the Funds 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 fund'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
accounting principles generally accepted in the United States of
America ("GAAP").  A fund'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 fund; (2) provide reasonable assurance that
transactions are recorded as necessary to permit preparation of
the financial statements in accordance with GAAP, and that
receipts and expenditures of the fund are being made only in
accordance with authorizations of management and trustees of
the fund; and (3) provide reasonable assurance regarding
prevention or timely detection of unauthorized acquisition, use or
disposition of a fund's assets that could have a material effect on
the financial statements.

Because of 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 Funds' annual or interim financial
statements will not be prevented or detected on a timely basis.

Our consideration of the Funds' 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 PCAOB.  However, we noted no
deficiencies in the Funds' 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 June 30, 2021.

This report is intended solely for the information and use of
management and the shareholders of Catalyst/Millburn Dynamic
Commodity Strategy Fund, Catalyst/Warrington Strategic
Program Fund, Catalyst Systematic Alpha Fund, Catalyst/Teza
Algorithmic Allocation Fund, Catalyst Multi-Strategy Fund,
EAVOL NASDAQ-100 Volatility Overlay Fund, Catalyst/Millburn
Hedge Strategy Fund, and Catalyst Buffered Shield Fund, the
Board of Trustees of Mutual Fund Series Trust 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/BBD, LLP


Philadelphia, Pennsylvania
August 30, 2021