SecProbe.io

CORRESP
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    CHAPMAN AND CUTLER LLP
    111 WEST MONROE STREET

CHICAGO, ILLINOIS
60603

January 23, 2020

VIA EDGAR CORRESPONDENCE

Ed Bartz

United States Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re:	First Trust Exchange-Traded Trust III (the
“Trust”)

File Nos. 333-176976; 811-22245

Dear Mr. Bartz:

This letter
responds to your comments, provided by telephone on December 5, 2019, regarding the registration statement filed on Form N-1A
for First Trust Exchange-Traded Fund III (the “Trust”) with the staff of the Securities and Exchange Commission
(the “Staff”) on October 18, 2019 (the “Registration Statement”). The Registration Statement
relates to the First Trust Vivaldi Merger Arbitrage ETF (the “Fund”), a series of the Trust. Please note that
the Fund had changed its name to First Trust Merger Arbitrage ETF. Capitalized terms used herein, but not otherwise defined, have
the meanings ascribed to them in the Registration Statement.

Comment 1 – General

Because this
is a new series, please provide a new legality opinion.

Response to Comment 1

The Fund confirms
that the legality opinion will be filed prior to the effectiveness of the Registration Statement.

Comment 2 – Fees
and Expenses of the Fund

Please provide
supplementally a completed fee table and expense example for the Fund prior to the effective date of the Registration Statement.

Response to Comment 2

Pursuant to
the Staff’s request, a completed fee table and expense example for the Fund has been set forth on Exhibit A to this
correspondence.

Comment 3 – General

Please advise
supplementally which exemptive order the Fund is relying on and explain how the Fund’s investment strategy is consistent
with that order.

Response to Comment 3

The Fund is
relying on its exemptive relief (Release No. 28468 (October 27, 2008) (File No 812-13477)) that allows it to utilize an active
management investment strategy.

Comment 4 – General

Please advise
whether the Fund has received a 19b-4 order, and if so please provide the Staff with a copy of that order.

Response to Comment 4

The Fund has
not received a 19b-4 order and intends to comply with the generic listing standards.

Comment
5 – Fees and Expenses of the Fund

Please confirm
supplementally that the expenses related to the Fund’s short selling strategy will be reflected in the Fee Table.

Response to Comment 5

The Fund confirms
that the expenses related to the Fund’s short selling strategy will be reflected in the Fee Table.

Comment 6 – Principal
Risks

The Staff notes
that the Principal Risks are listed in alphabetical order and asks the Fund to please revise the order in which risks are disclosed
to prioritize those that are most likely to adversely affect the Fund’s net asset value, yield and total return in accordance
with the Staff’s guidance in ADI 2019-08 – Improving Principal Risks Disclosure.

Response to Comment 6

The Fund respectfully
declines to revise the disclosure as requested by the Staff. Ultimately, the Fund has reached the same conclusion as many other
industry participants and declines to make the requested revisions as it believes the disclosure is compliant with the requirements
of Form N-1A.

Comment 7 – Principal
Risks

The Staff notes
the disclosure included in the “Portfolio Turnover Risk” and asks the Fund to please disclose the active and frequent
trading strategy in the sections entitled “Principal Investment Strategies” and “Additional Information on the
Fund’s Investment Objective and Strategies.”

Response to Comment 7

Pursuant to
the Staff’s request, the following disclosure has been added to the sections entitled “Principal Investment Strategies”
and “Additional Information on the Fund’s Investment Objective and Strategies”:

	The Fund’s
investment strategy may include active and frequent trading.

Comment 8 – Performance

Please advise
supplementally what broad measure of market performance the Fund intends to use.

Response to Comment 8

The Fund intends
to use the HFRX Merger Arbitrage Index and the Bloomberg Barclays Aggregate Bond Index for performance comparison purposes.

Comment 9 – Additional
Information on the Fund’s Investment Objective and Strategies

Please provide
a more detailed discussion of the Fund’s principal investment strategies and the particular type of securities in which the
Fund will principally invest as required by Item 9(b)(1).

Response to Comment 9

The Fund respectfully
declines to revise the disclosure as it believes its current disclosure is compliant with the requirements of Form N-1A.

Comment 10 – Fund
Investments

Please provide
a maturity policy or disclose the fact that there is no specific maturity policy in the paragraph entitled “Debt Securities.”

Response to Comment 10

Pursuant to
the Staff’s request, disclosure has been added to the paragraph entitled “Debt Securities” stating that the Fund
has no specific maturity policy.

Comment 11 – Additional
Risks of Investing in the Fund

Please remove
the word “Additional” from the heading for the section entitled “Additional Risks of Investing in the Fund.”

Response to Comment 11

Pursuant to
the Staff’s request, the prospectus has been revised accordingly.

********

Please call
me at (312) 845-3484 if you have any questions or issues you would like to discuss regarding these matters.

Sincerely yours,

Chapman and
Cutler llp

By /s/ Morrison C. Warren

Morrison C.
Warren

Exhibit A

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

    Management Fees
    1.25%

    Distribution and Service (12b-1) Fees
    0.00%

    Other Expenses(1)
    0.69%

    Total Annual Fund Operating Expenses
    1.94%

    (1)
    “Other
    Expenses” is an estimate based on the expenses the Fund expects to incur for the current fiscal year. The Fund is
    subject to interest expense and dividend expense on investments sold short.

Example

The example below is intended
to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into
account customary brokerage commissions that you pay when purchasing or selling shares of the Fund in the secondary market.

The example assumes that you
invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year
and that the Fund’s operating expenses remain at current levels. Although your actual costs may be higher or lower, based
on these assumptions your costs would be:

    1 Year
    3 Years

    $197

    $609