OFI Global Asset Management, Inc.
225 Liberty Street

New York, New York 10281-1008

November 1, 2018

VIA EDGAR

Securities and Exchange Commission
100 F Street, NE
Washington, DC 20549

Re: Oppenheimer Developing Markets Fund (the “Registrant”)
Reg. No. 333-05579; File No. 811-07657

To the Securities and Exchange Commission:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the “Securities Act“), I hereby represent that the form of Prospectus and Statement of Additional Information that would have been filed pursuant to Rule 497(c) under the Securities Act would not have differed from that contained in Post-Effective Amendment No. 38 to the Registrant’s Registration Statement on Form N-1A, which was filed electronically with the Securities and Exchange Commission on October 29, 2018.

Sincerely,

/s/ John G. Kiernan

John G. Kiernan
Vice President and Associate General Counsel
212-323-5020
jkiernan@ofiglobal.com

cc: Kramer Levin Naftalis & Frankel LLP
Taylor Edwards, Esq.