Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We consent to the incorporation by reference in Registration Statement No. 333-233292 and 333-249324

on Form S-8 of HarborOne Bancorp, Inc. of our report dated March 7, 2024 relating to the financial

statements and effectiveness of internal control over financial reporting, appearing in this Annual Report on Form 10-K.

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New York, New York

March 7, 2024