Exhibit (b)

EX-99-906CERT

Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

James E. Ross, Chief Executive Officer and Gary L. French, Chief Financial
Officer of the State Street Master Funds (the "Trust"), certify that:

1.   This Form N-CSR filing for the Trust (the "Report") 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 Report fairly presents, in all material
     respects, the financial condition and results of operations of the Trust.


By: /s/ James E. Ross
    ------------------------------------
    James E. Ross
    Chief Executive Officer of the Trust

Date: August 20, 2008


By: /s/ Gary L. French
    ------------------------------------
    Gary L. French
    Chief Financial Officer of the Trust

Date: August 20, 2008