Exhibit 13

                          O2Micro International Limited

                                  CERTIFICATION

In connection with the periodic report of O2Micro International Limited (the
"Company") on Form 20-F for the period ended December 31, 2003, as filed with
the Securities and Exchange Commission (the "Report"), each of Sterling Du,
President and Chief Executive Officer of the Company, and Perry Kuo, Chief
Financial Officer of the Company, hereby certify as of the date hereof, solely
for purposes of Title 18, Chapter 63, Section 1350 of the United States Code,
that to the best of his knowledge:

     (1)  the Report fully complies with the requirements of Section 13(a) or
          15(d), as applicable, of the Securities Exchange Act of 1934, and

     (2)  the information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company at the dates and for the periods indicated.

This Certification has not been, and shall not be deemed, "filed" with the
Securities and Exchange Commission.


Date: June 10, 2004                                  /s/ STERLING DU
                                         ---------------------------------------
                                                       Sterling Du
                                          President and Chief Executive Officer


Date: June 10, 2004                                   /s/ PERRY KUO
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                                                        Perry Kuo
                                                 Chief Financial Officer