SecProbe.io

CORRESP
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    ROPES & GRAY LLP

                                                                     191 North Wacker Drive,
                                            32nd Floor

                                                                     Chicago, IL 60606

                                                                     WWW.ROPESGRAY.COM

November 20, 2024 Rita Rubin

    T +312-845-1241

    Rita.Rubin@ropesgray.com

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

    Re:
    Calamos ETF Trust (“Registrant” or “Trust”) on behalf of ten of its series,

    Calamos Bitcoin 100% Protection Strategy (6 mo) ETF — Month TBD 1

    Calamos Bitcoin 100% Protection Strategy (6 mo) ETF — Month TBD 2

    Calamos Bitcoin 90% Protection Strategy ETF —
    Month TBD 1

    Calamos Bitcoin 90% Protection Strategy ETF —
    Month TBD 2

    Calamos Bitcoin 90% Protection Strategy ETF —
    Month TBD 3

    Calamos Bitcoin 90% Protection Strategy ETF —
    Month TBD 4

    Calamos Bitcoin 80% Protection Strategy ETF — Month TBD
    1

    Calamos Bitcoin 80% Protection Strategy ETF — Month TBD
    2

    Calamos Bitcoin 80% Protection Strategy ETF — Month TBD
    3

    Calamos Bitcoin 80% Protection Strategy ETF — Month TBD
    4

    (each, a “Fund” and collectively, the “Funds”)

    (File Nos. 333-191151 and 811-22887)

Ladies and Gentlemen:

On
behalf of the Registrant, in connection with the establishment of ten new series of Calamos ETF Trust, we are filing today by electronic
submission via EDGAR pursuant to Rule 485(a)(2) three post-effective amendments (Post-Effective Amendment Nos. 45, 46,
and 47) to the Trust’s registration statement on Form N-1A a copy of each of the following:

 1. Prospectuses relating to the ten new ETFs (the “Prospectuses”); and

 2. Statements of additional information relating to the ten new ETFs (the “SAIs”).

Except
as indicated below, the disclosure for each of the ETFs is based on and substantially similar to disclosure previously reviewed by the
staff of the U.S. Securities and Exchange Commission (“SEC”) in the Registrant’s filing on Form N-1A (SEC Accession
Number 0001104659-24-102657) filed on September 25, 2024 pursuant to Rule 485(b) of the Securities Act of 1933,
as amended, (the “Securities Act”) (the “Precedent Filing”).

The
Registrant requests selective review of Post-Effective Amendment Nos. 45, 46, and 47 in accordance with the SEC’s release
on selective review, Revised Procedures For Processing Registration Statements, Post-Effective Amendments and Preliminary Proxy Materials
Filed by Registered Investment Companies, Investment Company Act Release No. 13768 (February 15, 1984).

    - 2 -

Prospectuses

The
Precedent Filing registered the following ETFs which had the following characteristics:

    Fund Name
    Launch Date
    Start of Outcome Period

    Calamos Bitcoin Structured Alt Protection ETF — Month TBD 1
    TBD
    TBD

    Calamos Bitcoin Structured Alt Protection ETF — Month TBD 2
    TBD
    TBD

    Calamos Bitcoin Structured Alt Protection ETF — Month TBD 3
    TBD
    TBD

    Calamos Bitcoin Structured Alt Protection ETF — Month TBD 4
    TBD
    TBD

The Registrant requests selective review of the Prospectuses listed
below. The Prospectuses are substantially similar to the prospectuses in the Precedent Filing. The primary differences are the ETF names,
launch dates, downside protection limits, the investment objective and strategy with respect to the underlying ETP(s) and index,
the types of options the Fund may use to implement its strategy and the dates on which the respective outcome periods begin and reset
for each of the ten new ETFs:1

    Fund Name per Upcoming

Pre-Effective Registration

Statement Filing
    Launch Date per

Upcoming Pre-Effective

Registration Statement

 Filing
    Outcome Period Reset dates per

 Upcoming Pre-Effective

 Registration Statement Filing

    Calamos
    Bitcoin 100% Protection Strategy (6 mo) ETF — Month TBD 1
    TBD
    TBD

    Calamos
    Bitcoin 100% Protection Strategy (6 mo) ETF — Month TBD 2
    TBD
    TBD

    Calamos
    Bitcoin 90% Protection Strategy ETF — Month TBD 1
    TBD
    TBD

    Calamos
    Bitcoin 90% Protection Strategy ETF — Month TBD 2
    TBD
    TBD

    Calamos
    Bitcoin 90% Protection Strategy ETF — Month TBD 3
    TBD
    TBD

    Calamos
    Bitcoin 90% Protection Strategy ETF — Month TBD 4
    TBD
    TBD

    Calamos
    Bitcoin 80% Protection Strategy ETF — Month TBD 1
    TBD
    TBD

    Calamos
    Bitcoin 80% Protection Strategy ETF — Month TBD 2
    TBD
    TBD

    Calamos
    Bitcoin 80% Protection Strategy ETF — Month TBD 3
    TBD
    TBD

    Calamos
    Bitcoin 80% Protection Strategy ETF — Month TBD 4
    TBD
    TBD

1
As explained in more detail in the Prospectus of each new series, the outcome period is an approximate six-month or one-year
period, depending on the series, over which each Fund seeks to produce a targeted result. The Funds will not terminate after the conclusion
of the Outcome Period. After the conclusion of the Outcome Period, another will begin.

    - 3 -

SAIs

The
Registrant requests selective review of the SAIs, which are being filed with language that is substantially similar to the Precedent
Filing. The differences in the disclosure in these SAIs is that the new SAIs will contain new ETF names, launch dates, downside protection
limits, the investment objective and strategy with respect to the underlying ETP(s) and index, the types of options the Fund may
use to implement its strategy and the dates on which the outcome periods begin and reset.

Please direct any questions you may have with respect to this filing
to me at (312) 845-1241.

Very truly yours,

  /s/ Rita Rubin

Rita Rubin, Esq.

    cc:
    John P. Calamos, Sr.

    Erik D. Ojala, Esq.

    J. Christopher Jackson, Esq.

    Susan L. Schoenberger, Esq.

    Paulita Pike, Esq.

    Elizabeth Madsen, Esq.

    C. Lawrence Zmerega, Esq.

    Daniel Koningisor, Esq.