OppenheimerFunds, Inc.
Two World Financial Center
225 Liberty Street, 11th Floor
New York, NY 10281-1008
 

January 3, 2012
 

VIA EDGAR
 

Securities and Exchange Commission
Mail Stop 0-7, Filer Support
6432 General Green Way
Alexandria, VA 22312

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. 22 to the Registrant’s Registration Statement on Form N-1A, which was filed electronically with the Securities and Exchange Commission on December 23, 2011.

Sincerely,

/s/ Emily Petkun Ast

Emily Petkun Ast

Assistant Vice President &

Assistant Counsel

212-323-5086

east@oppenheimerfunds.com

cc:      Kramer Levin Naftalis & Frankel LLP

          Gloria LaFond

     Taylor V. Edwards