CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officers of Pax World Funds Series Trust I (the “Registrant”), certify that:

1. The Form N-CSR of the Registrant for the period ended December 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Form N-CSR of the Registrant for the period ended December 31, 2009 fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: February 25, 2010

/s/ Joseph F. Keefe  

Joseph F. Keefe 

President (Principal Executive Officer) 

/s/ Alicia K. DuBois  

Alicia K. DuBois 

Treasurer (Principal Financial Officer)