BioMarin Pharmaceutical (BMRN) 10-Q 2013 Q1 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

We, Jean-Jacques Bienaimé and Daniel Spiegelman hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that BioMarin Pharmaceutical Inc.’s Quarterly Report on Form 10-Q for the period ended March 31, 2013, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of BioMarin Pharmaceutical Inc.

/s/    JEAN-JACQUES BIENAIMÉ

Jean-Jacques Bienaimé

Chief Executive Officer

April 29, 2013

/s/    DANIEL SPIEGELMAN

Daniel Spiegelman

Executive Vice President and Chief Financial Officer

April 29, 2013