Exhibit 23.3

CONSENT OF INDEPENDENT AUDITOR

We consent to the inclusion in this Registration Statement on Form S-4 of Seacoast Banking Corporation of Florida of our report dated March 6, 2025, relating to the consolidated financial statements of Heartland Bancshares, Inc. and Subsidiary as of and for the years ended December 31, 2024 and 2023.

We also consent to the reference to us under the heading "Experts" in the prospectus included with the Form S-4.

Orlando, Florida

May 9, 2025

Saltmarsh, Cleaveland & Gund

saltmarshcpa.com │ Since 1944 │ (800) 477-7458

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