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CORRESP
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October 31, 2022

VIA EDGAR

Division of Investment
Management

U.S. Securities and Exchange
Commission

100 F Street, N.E.

Washington, D.C. 02549

Attention: Sonny Oh

    Re:
    John Hancock Collateral Trust - File No. 811-23027 (the “Trust” or “Registrant”)

Dear Mr. Oh:

This letter is in response to comments
received by telephone on October 12, 2022 from the staff (“Staff”) of the Securities and Exchange Commission (the “SEC”)
with respect to the Registration Statement Supplements, which were filed with the SEC on August 31, 2022 and September 20, 2022, respectively,
(each, a “POS AMI”) for the Trust.

For your convenience, we have repeated each comment
below, and our responses follow your comments. Capitalized terms not otherwise defined herein have the same meanings as defined in the
POS AMI, unless otherwise indicated.

1. Comment 1: For future filings made by the Trust, please consider specifically noting the
                                            provision(s) of the Registration Statement to which each POS AMI pertains. Additionally,
                                            please indicate whether any POS AMI disclosure replaces or supplements the provision(s) of
                                            the Registration Statement and state with specificity where such language is to be included
                                            in the Registration Statement.

  Response: The Registrant acknowledges the Staff’s comments and confirms that specificity
                                            with respect to amendments to the Registration Statement that describe how such disclosure
                                            will be amended will be reflected in future amendments to the Trust’s Registration
                                            Statement.

2. Comment 2: Please revise the Trustee share
                                                           ownership and compensation tables to reflect the information required by Form N-1A.

  Response:
                                            The Instructions to Form N-1A state that Trustee ownership information should be provided
                                            as of the end of the most recently completed calendar year (see Instruction 1 to Item
                                            17(b)(4) of Form N-1A). The Trustees are newly elected to the Trust as of September 9, 2022
                                            and Item 17(c) of Form N-1A sets forth that Trustee compensation information should be provided
                                            for the most recently completed fiscal year. Accordingly, the Registrant confirms it will
                                            update the Trustee compensation and share ownership tables at the next annual update of the
                                            Trust.

If you have any questions, please call me at
(617) 951-9068.

    Sincerely,

    /s/ Trayne S. Wheeler

    Trayne S. Wheeler

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