Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated March 19, 2007, relating to the financial statements of iShares Silver Trust, which is also incorporated by reference in such Registration Statement. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

PricewaterhouseCoopers LLP

San Francisco, California

July 9, 2007