COLUMBIA FUNDS SERIES TRUST I

225 Franklin Street

Boston, MA 02110

June 1, 2018

VIA EDGAR

Mr. Mark Cowan

U.S. Securities and Exchange Commission

Division of Investment Management

100 F Street, N.E.

Washington, D.C. 20549

RE: Columbia Funds Series Trust I (the Registrant)

Columbia Diversified Real Return Fund

Post-Effective Amendment No. 328

File Nos. 002-99356 /811-04367

Dear Mr. Cowan:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter as certification that the prospectus and Statement of Additional Information for the above-referenced fund does not differ from that contained in Registrant’s Post-Effective Amendment No. 328 (Amendment). This Amendment was filed electronically on May 29, 2018.

If you have any questions, please contact either me at (212) 850-1703 or Anna Butskaya at (612) 671-4993.

Sincerely,

/s/ Joseph D’Alessandro

Joseph D’Alessandro

Assistant Secretary

Columbia Funds Series Trust I