Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement of Origin Bancorp, Inc. (the “Company”) on Form S-8 (No. 333-226115) of our report, dated February 28, 2020, on our audits of the consolidated financial statements of the Company as of December 31, 2019 and 2018, and for each of the years in the three-year period ended December 31, 2019, which report is included in the Company’s Annual Report on Form 10-K. We also consent to the incorporation by reference of our report dated February 28, 2020, on our audit of the internal control over financial reporting of Origin Bancorp, Inc. as of December 31, 2019, which is included in the Annual Report on Form 10-K.

/s/ BKD, LLP

Little Rock, Arkansas

February 28, 2020